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TI-2020-15721 Aliases CVE-2020-25705GHSA-33cf-w34p-g6pj

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP…

Priority MEDIUM 42CWE-330Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 35 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version

Why it matters now

EPSS 0.06692 93rd percentileScored 2026-11-07
Fix Partial Red Hat: 10 advisoriesRed Hat: 35 fixed, 4 without a fix

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
—Siemens Lunux Based Productsall versions—No fix listedCNA
  • Siemens Lunux Based Products Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*before 5.10.0VulnerableLinux
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.10.0 Vulnerable ·Linux
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat

Remediation

Red Hat 10 advisories

  • RHSA-2021:2355 Released 2021-06-09 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.6) bpftool-3.10.0-957.76.1.el7, kernel-3.10.0-957.76.1.el7, kernel-abi-whitelists-3.10.0-957.76.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.6) bpftool-3.10.0-957.76.1.el7, kernel-3.10.0-957.76.1.el7, kernel-abi-whitelists-3.10.0-957.76.1.el7 +10
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.76.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debug-devel-3.10.0-957.76.1.el7, kernel-tools-libs-devel-3.10.0-957.76.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.76.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.6) bpftool-3.10.0-957.76.1.el7, kernel-3.10.0-957.76.1.el7, kernel-abi-whitelists-3.10.0-957.76.1.el7 +8
  • RHSA-2021:2164 Released 2021-06-01 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-3.10.0-693.87.1.el7, kernel-abi-whitelists-3.10.0-693.87.1.el7, kernel-debug-3.10.0-693.87.1.el7 +7
    • Red Hat Enterprise Linux Server E4S (v. 7.4) kernel-3.10.0-693.87.1.el7, kernel-abi-whitelists-3.10.0-693.87.1.el7, kernel-bootwrapper-3.10.0-693.87.1.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.87.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.4) kernel-debug-devel-3.10.0-693.87.1.el7, kernel-tools-libs-devel-3.10.0-693.87.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.87.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.4) kernel-3.10.0-693.87.1.el7, kernel-abi-whitelists-3.10.0-693.87.1.el7, kernel-debug-3.10.0-693.87.1.el7 +7
  • RHSA-2021:1531 Released 2021-05-11 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) bpftool-3.10.0-1062.49.1.el7, kernel-3.10.0-1062.49.1.el7, kernel-abi-whitelists-3.10.0-1062.49.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.49.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.7) bpftool-3.10.0-1062.49.1.el7, kernel-3.10.0-1062.49.1.el7, kernel-abi-whitelists-3.10.0-1062.49.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) kernel-debug-devel-3.10.0-1062.49.1.el7, kernel-tools-libs-devel-3.10.0-1062.49.1.el7
Show 7 more Red Hat advisories
  • RHSA-2021:0856 Released 2021-03-16 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.21.1.el7, kernel-3.10.0-1160.21.1.el7, kernel-abi-whitelists-3.10.0-1160.21.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.21.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.21.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.21.1.el7, kernel-3.10.0-1160.21.1.el7, kernel-abi-whitelists-3.10.0-1160.21.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.21.1.el7, kernel-tools-libs-devel-3.10.0-1160.21.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.21.1.el7, kernel-3.10.0-1160.21.1.el7, kernel-abi-whitelists-3.10.0-1160.21.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.21.1.el7
  • RHSA-2021:0857 Released 2021-03-16 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.21.1.rt56.1158.el7, kernel-rt-debug-3.10.0-1160.21.1.rt56.1158.el7, kernel-rt-debug-devel-3.10.0-1160.21.1.rt56.1158.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.21.1.rt56.1158.el7, kernel-rt-debug-3.10.0-1160.21.1.rt56.1158.el7, kernel-rt-debug-devel-3.10.0-1160.21.1.rt56.1158.el7 +7
  • RHSA-2021:0765 Released 2021-03-09 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-tools-libs-devel-4.18.0-193.46.1.el8_2
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) bpftool-4.18.0-193.46.1.el8_2, kernel-4.18.0-193.46.1.el8_2, kernel-abi-whitelists-4.18.0-193.46.1.el8_2 +19
  • RHSA-2021:0774 Released 2021-03-09 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt-4.18.0-193.46.1.rt13.96.el8_2, kernel-rt-core-4.18.0-193.46.1.rt13.96.el8_2, kernel-rt-debug-4.18.0-193.46.1.rt13.96.el8_2 +7
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt-4.18.0-193.46.1.rt13.96.el8_2, kernel-rt-core-4.18.0-193.46.1.rt13.96.el8_2, kernel-rt-debug-4.18.0-193.46.1.rt13.96.el8_2 +9
  • RHSA-2021:0686 Released 2021-03-03 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder EUS (v. 8.1)
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) kernel-4.18.0-147.43.1.el8_1, kernel-core-4.18.0-147.43.1.el8_1, kernel-debug-4.18.0-147.43.1.el8_1 +12
  • RHSA-2021:0537 Released 2021-02-16 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-240.15.1.rt7.69.el8_3, kernel-rt-core-4.18.0-240.15.1.rt7.69.el8_3, kernel-rt-debug-4.18.0-240.15.1.rt7.69.el8_3 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-240.15.1.rt7.69.el8_3, kernel-rt-core-4.18.0-240.15.1.rt7.69.el8_3, kernel-rt-debug-4.18.0-240.15.1.rt7.69.el8_3 +9
  • RHSA-2021:0558 Released 2021-02-16 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.15.1.el8_3
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.15.1.el8_3, kernel-4.18.0-240.15.1.el8_3, kernel-abi-whitelists-4.18.0-240.15.1.el8_3 +19

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat Enterprise MRG 2AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:0558
Red Hat CodeReady Linux Builder EUS (v. 8.1)Fixed RHSA-2021:0686
Red Hat CodeReady Linux Builder EUS (v. 8.2)Fixed RHSA-2021:0765
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:0558
Red Hat Enterprise Linux BaseOS EUS (v. 8.1)Fixed RHSA-2021:0686
Red Hat Enterprise Linux BaseOS EUS (v. 8.2)Fixed RHSA-2021:0765
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux ComputeNode EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:0537
Red Hat Enterprise Linux Real Time EUS (v. 8.2)Fixed RHSA-2021:0774
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:0537
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2)Fixed RHSA-2021:0774
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2021:2164
Red Hat Enterprise Linux Server AUS (v. 7.6)Fixed RHSA-2021:2355
Red Hat Enterprise Linux Server E4S (v. 7.4)Fixed RHSA-2021:2164
Red Hat Enterprise Linux Server E4S (v. 7.6)Fixed RHSA-2021:2355
Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2021:2164
Red Hat Enterprise Linux Server Optional AUS (v. 7.6)Fixed RHSA-2021:2355
Red Hat Enterprise Linux Server Optional E4S (v. 7.4)Fixed RHSA-2021:2164
Red Hat Enterprise Linux Server Optional E4S (v. 7.6)Fixed RHSA-2021:2355
Red Hat Enterprise Linux Server Optional EUS (v. 7.7)Fixed RHSA-2021:1531
Red Hat Enterprise Linux Server Optional TUS (v. 7.4)Fixed RHSA-2021:2164
Red Hat Enterprise Linux Server Optional TUS (v. 7.6)Fixed RHSA-2021:2355
Red Hat Enterprise Linux Server TUS (v. 7.4)Fixed RHSA-2021:2164
Red Hat Enterprise Linux Server TUS (v. 7.6)Fixed RHSA-2021:2355
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:0856
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2021:0857
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2021:0857
Not affected: 2 products
  • Red Hat CodeReady Linux Builder EUS (v. 8.1)
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-25705
  2. 2026-10-03 Alias added: GHSA-33cf-w34p-g6pj

References

Other 1

Sources

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