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TI-2021-20274 Aliases CVE-2021-44790GHSA-c547-2659-q37g

Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier

Priority CRITICAL 86CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 28 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

Why it matters now

EPSS 0.9684 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 8 advisoriesRed Hat: 28 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache HTTP ServerApache HTTP Server 2.4 – 2.4.51—No fix listedCNA
  • Apache HTTP Server VendorApache Affected Apache HTTP Server 2.4 – 2.4.51 Fixed in — No fix listed CNA

CPE configurations NVD · 33

CPEVersionsRoleVendor
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*before 2.4.52VulnerableApache
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*35VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*36VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*5.16.0 to before 5.20.0VulnerableTenable
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:oracle:communications_element_manager:*:*:*:*:*:*:*:*up to 9.0VulnerableOracle
cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:*4.3VulnerableOracle
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions before 2.4.52 Vulnerable ·Apache
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
  • cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:* Versions 5.16.0 to before 5.20.0 Vulnerable ·Tenable
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:oracle:communications_element_manager:*:*:*:*:*:*:*:* Versions up to 9.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:* Versions 4.3 Vulnerable ·Oracle
Show 23 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:*4.4VulnerableOracle
cpe:2.3:a:oracle:communications_operations_monitor:5.0:*:*:*:*:*:*:*5.0VulnerableOracle
cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:*up to 9.0VulnerableOracle
cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:*up to 9.0VulnerableOracle
cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*12.2.1.3.0VulnerableOracle
cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*12.2.1.4.0VulnerableOracle
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*17.1VulnerableOracle
cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*17.2VulnerableOracle
cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*17.3VulnerableOracle
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*8.8VulnerableOracle
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*10.15.7 security_update_2020-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*10.15.7 security_update_2021-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*10.15.7 security_update_2021-002VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*10.15.7 security_update_2021-003VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:*10.15.7 security_update_2021-004VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:*10.15.7 security_update_2021-005VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:*10.15.7 security_update_2021-006VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:*10.15.7 security_update_2021-007VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:*10.15.7 security_update_2021-008VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:*10.15.7 security_update_2022-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002:*:*:*:*:*:*10.15.7 security_update_2022-002VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:*10.15.7 security_update_2022-003VulnerableApple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*before 10.15.7; 11.0 to before 11.6.6; 12.0 to before 12.4VulnerableApple
  • cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:* Versions 4.4 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_operations_monitor:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:* Versions up to 9.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:* Versions up to 9.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:* Versions 12.2.1.3.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:* Versions 12.2.1.4.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:* Versions 17.1 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:* Versions 17.2 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:* Versions 17.3 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* Versions 8.8 Vulnerable ·Oracle
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* Versions 10.15.7 security_update_2020-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* Versions 10.15.7 security_update_2021-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* Versions 10.15.7 security_update_2021-002 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* Versions 10.15.7 security_update_2021-003 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* Versions 10.15.7 security_update_2021-004 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:* Versions 10.15.7 security_update_2021-005 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:* Versions 10.15.7 security_update_2021-006 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:* Versions 10.15.7 security_update_2021-007 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:* Versions 10.15.7 security_update_2021-008 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:* Versions 10.15.7 security_update_2022-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002:*:*:*:*:*:* Versions 10.15.7 security_update_2022-002 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:* Versions 10.15.7 security_update_2022-003 Vulnerable ·Apple
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 10.15.7; 11.0 to before 11.6.6; 12.0 to before 12.4 Vulnerable ·Apple

Remediation

Red Hat 8 advisories

  • RHSA-2022:1136 Released 2022-04-01 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux Server AUS (v. 7.6) httpd-2.4.6-89.el7_6.4, httpd-devel-2.4.6-89.el7_6.4, httpd-manual-2.4.6-89.el7_6.4 +3
    • Red Hat Enterprise Linux Server E4S (v. 7.6) httpd-2.4.6-89.el7_6.4, httpd-devel-2.4.6-89.el7_6.4, httpd-manual-2.4.6-89.el7_6.4 +3
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) mod_ldap-2.4.6-89.el7_6.4, mod_proxy_html-1:2.4.6-89.el7_6.4
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) mod_ldap-2.4.6-89.el7_6.4, mod_proxy_html-1:2.4.6-89.el7_6.4
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) mod_ldap-2.4.6-89.el7_6.4, mod_proxy_html-1:2.4.6-89.el7_6.4
    • Red Hat Enterprise Linux Server TUS (v. 7.6) httpd-2.4.6-89.el7_6.4, httpd-devel-2.4.6-89.el7_6.4, httpd-manual-2.4.6-89.el7_6.4 +3
  • RHSA-2022:1139 Released 2022-04-01 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux Server AUS (v. 7.3) httpd-2.4.6-45.el7_3.8, httpd-devel-2.4.6-45.el7_3.8, httpd-manual-2.4.6-45.el7_3.8 +2
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) mod_ldap-2.4.6-45.el7_3.8, mod_proxy_html-1:2.4.6-45.el7_3.8, mod_session-2.4.6-45.el7_3.8
  • RHSA-2022:1137 Released 2022-04-01 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux Server AUS (v. 7.7) httpd-2.4.6-90.el7_7.3, httpd-devel-2.4.6-90.el7_7.3, httpd-manual-2.4.6-90.el7_7.3 +3
    • Red Hat Enterprise Linux Server E4S (v. 7.7) httpd-2.4.6-90.el7_7.3, httpd-devel-2.4.6-90.el7_7.3, httpd-manual-2.4.6-90.el7_7.3 +3
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) mod_ldap-2.4.6-90.el7_7.3, mod_proxy_html-1:2.4.6-90.el7_7.3
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) mod_ldap-2.4.6-90.el7_7.3, mod_proxy_html-1:2.4.6-90.el7_7.3
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) mod_ldap-2.4.6-90.el7_7.3, mod_proxy_html-1:2.4.6-90.el7_7.3
    • Red Hat Enterprise Linux Server TUS (v. 7.7) httpd-2.4.6-90.el7_7.3, httpd-devel-2.4.6-90.el7_7.3, httpd-manual-2.4.6-90.el7_7.3 +3
Show 5 more Red Hat advisories
  • RHSA-2022:1138 Released 2022-04-01 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) httpd-2.4.6-67.el7_4.9, httpd-devel-2.4.6-67.el7_4.9, httpd-manual-2.4.6-67.el7_4.9 +3
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) mod_ldap-2.4.6-67.el7_4.9, mod_proxy_html-1:2.4.6-67.el7_4.9
  • RHSA-2022:0303 Released 2022-01-27 · Red Hat rating Important
    httpd24-httpd security update
    • Red Hat Software Collections for RHEL Workstation(v. 7) httpd24-httpd-2.4.34-23.el7.1, httpd24-httpd-devel-2.4.34-23.el7.1, httpd24-httpd-manual-2.4.34-23.el7.1 +5
    • Red Hat Software Collections for RHEL(v. 7) httpd24-httpd-2.4.34-23.el7.1, httpd24-httpd-devel-2.4.34-23.el7.1, httpd24-httpd-manual-2.4.34-23.el7.1 +5
  • RHSA-2022:0288 Released 2022-01-26 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) httpd-2.4.37-16.module+el8.1.0+13809+822d170a.3.ppc64le::httpd:2.4, httpd-2.4.37-16.module+el8.1.0+13809+822d170a.3.src::httpd:2.4, httpd-2.4.37-16.module+el8.1.0+13809+822d170a.3.x86_64::httpd:2.4 +19
  • RHSA-2022:0258 Released 2022-01-25 · Red Hat rating Important
    httpd:2.4 security update
    • Red Hat Enterprise Linux AppStream (v. 8) httpd-2.4.37-43.module+el8.5.0+13806+b30d9eec.1.aarch64::httpd:2.4, httpd-2.4.37-43.module+el8.5.0+13806+b30d9eec.1.ppc64le::httpd:2.4, httpd-2.4.37-43.module+el8.5.0+13806+b30d9eec.1.s390x::httpd:2.4 +38
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) httpd-2.4.37-21.module+el8.2.0+13808+dea277df.3.aarch64::httpd:2.4, httpd-2.4.37-21.module+el8.2.0+13808+dea277df.3.ppc64le::httpd:2.4, httpd-2.4.37-21.module+el8.2.0+13808+dea277df.3.s390x::httpd:2.4 +38
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) httpd-2.4.37-39.module+el8.4.0+13807+c8c001ae.3.aarch64::httpd:2.4, httpd-2.4.37-39.module+el8.4.0+13807+c8c001ae.3.ppc64le::httpd:2.4, httpd-2.4.37-39.module+el8.4.0+13807+c8c001ae.3.s390x::httpd:2.4 +38
  • RHSA-2022:0143 Released 2022-01-17 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux Client Optional (v. 7) httpd-2.4.6-97.el7_9.4, httpd-devel-2.4.6-97.el7_9.4, httpd-manual-2.4.6-97.el7_9.4 +5
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd-2.4.6-97.el7_9.4, httpd-devel-2.4.6-97.el7_9.4, httpd-manual-2.4.6-97.el7_9.4 +5
    • Red Hat Enterprise Linux Server (v. 7) httpd-2.4.6-97.el7_9.4, httpd-devel-2.4.6-97.el7_9.4, httpd-manual-2.4.6-97.el7_9.4 +3
    • Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap-2.4.6-97.el7_9.4, mod_proxy_html-1:2.4.6-97.el7_9.4
    • Red Hat Enterprise Linux Workstation (v. 7) httpd-2.4.6-97.el7_9.4, httpd-devel-2.4.6-97.el7_9.4, httpd-manual-2.4.6-97.el7_9.4 +3
    • Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap-2.4.6-97.el7_9.4, mod_proxy_html-1:2.4.6-97.el7_9.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Apache HTTP Server — FEDORA-2021-29a536c2ae

    2 records Highest priority Priority CRITICAL 1 CRITICAL, 1 HIGH

    Other records, highest priority first

    • TI-2021-19915 Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlierPriority HIGH 76
    Show all 2 records → Advisory →
  • Advisory ·

    Apache HTTP Server — DSA-5035

    2 records Highest priority Priority CRITICAL 1 CRITICAL, 1 HIGH

    Other records, highest priority first

    • TI-2021-19915 Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlierPriority HIGH 76
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat JBoss Enterprise Application Platform 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:0258
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2022:0288
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2022:0258
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2022:0258
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:0143
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2022:0143
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:0143
Red Hat Enterprise Linux Server AUS (v. 7.3)Fixed RHSA-2022:1139
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2022:1138
Red Hat Enterprise Linux Server AUS (v. 7.6)Fixed RHSA-2022:1136
Red Hat Enterprise Linux Server AUS (v. 7.7)Fixed RHSA-2022:1137
Red Hat Enterprise Linux Server E4S (v. 7.6)Fixed RHSA-2022:1136
Red Hat Enterprise Linux Server E4S (v. 7.7)Fixed RHSA-2022:1137
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:0143
Red Hat Enterprise Linux Server Optional AUS (v. 7.3)Fixed RHSA-2022:1139
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2022:1138
Red Hat Enterprise Linux Server Optional AUS (v. 7.6)Fixed RHSA-2022:1136
Red Hat Enterprise Linux Server Optional AUS (v. 7.7)Fixed RHSA-2022:1137
Red Hat Enterprise Linux Server Optional E4S (v. 7.6)Fixed RHSA-2022:1136
Red Hat Enterprise Linux Server Optional E4S (v. 7.7)Fixed RHSA-2022:1137
Red Hat Enterprise Linux Server Optional TUS (v. 7.6)Fixed RHSA-2022:1136
Red Hat Enterprise Linux Server Optional TUS (v. 7.7)Fixed RHSA-2022:1137
Red Hat Enterprise Linux Server TUS (v. 7.6)Fixed RHSA-2022:1136
Red Hat Enterprise Linux Server TUS (v. 7.7)Fixed RHSA-2022:1137
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:0143
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:0143
Red Hat Software Collections for RHEL Workstation(v. 7)Fixed RHSA-2022:0303
Red Hat Software Collections for RHEL(v. 7)Fixed RHSA-2022:0303
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 9
  • Red Hat JBoss Core Services

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-44790
  2. 2026-10-03 Alias added: GHSA-c547-2659-q37g

References

Exploit 1

Patch 2

Advisory 17

  • TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
  • TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
  • TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
See all 349 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences