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TI-2025-21772 Aliases CVE-2025-30472GHSA-4q2r-xgxr-vvqm

Stack-based buffer overflow in Corosync

Priority HIGH 76CWE-121Published · 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: 7 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-121 and the CVSS impact.

Summary

Corosync through 3.1.9, if encryption is disabled or the attacker knows the encryption key, has a stack-based buffer overflow in orf_token_endian_convert in exec/totemsrp.c via a large UDP packet.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00469 40th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 2 advisoriesRed Hat: 7 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CorosyncCorosyncup to 3.1.9—No fix listedCNA
  • Corosync VendorCorosync Affected up to 3.1.9 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:corosync:corosync:*:*:*:*:*:*:*:*up to 3.1.9VulnerableCorosync
  • cpe:2.3:a:corosync:corosync:*:*:*:*:*:*:*:* Versions up to 3.1.9 Vulnerable ·Corosync

Remediation

Red Hat 2 advisories

  • RHSA-2025:7478 Released 2025-05-13 · Red Hat rating Moderate
    corosync security update
    • Red Hat Enterprise Linux AppStream (v. 10) corosync-3.1.9-1.el10_0.1, corosynclib-3.1.9-1.el10_0.1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) corosync-vqsim-3.1.9-1.el10_0.1
    • Red Hat Enterprise Linux High Availability (v. 10) corosync-3.1.9-1.el10_0.1, corosynclib-devel-3.1.9-1.el10_0.1
  • RHSA-2025:7201 Released 2025-05-13 · Red Hat rating Moderate
    corosync security update
    • Red Hat Enterprise Linux AppStream (v. 9) corosync-3.1.9-2.el9_6, corosynclib-3.1.9-2.el9_6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) corosync-vqsim-3.1.9-2.el9_6
    • Red Hat Enterprise Linux High Availability (v. 9) corosync-3.1.9-2.el9_6, corosynclib-devel-3.1.9-2.el9_6
    • Red Hat Enterprise Linux Resilient Storage (v. 9) corosync-3.1.9-2.el9_6, corosynclib-devel-3.1.9-2.el9_6

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:7478
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:7201
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:7478
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:7201
Red Hat Enterprise Linux High Availability (v. 10)Fixed RHSA-2025:7478
Red Hat Enterprise Linux High Availability (v. 9)Fixed RHSA-2025:7201
Red Hat Enterprise Linux Resilient Storage (v. 9)Fixed RHSA-2025:7201

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-30472
  2. 2026-10-03 Alias added: GHSA-4q2r-xgxr-vvqm

References

Exploit 1

Other 2

  • TI-2026-27291 Corosync: corosync: denial of service and information disclosure via crafted udp packet CVSS 3.1HIGH 8.2
  • TI-2026-27292 Corosync: corosync: denial of service via integer overflow in join message validation CVSS 3.1HIGH 7.5
  • TI-2018-01003 corosync before version 2.4.4 is vulnerable to an integer overflow in exec/totemcrypto.c. CVSS 3.1HIGH 7.5
  • TI-2013-00184 The init_nss_hash function in exec/totemcrypto.c in Corosync 2.0 before 2.3 does not… CVSS 2.0MEDIUM 5.0

Sources

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