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CVE record · CVE-2025-20352

Stack-based buffer overflow in Cisco IOS and others

CVSS 7.7 HighCriticalIn CISA KEVEPSS 0.41 · 98th percentile

Critical, because:

  • In CISA’s KEV catalogue since 29 Sept 2025: it is known to be exploited.
  • CVSS score 7.7 (7.0 or more) and EPSS 0.41 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: cisco) at 24 Sept 2025, 17:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Cisco IOS
  • affected 12.2(55)SE
  • affected 12.2(55)SE3
  • affected 12.2(55)SE2
  • affected 12.2(58)SE
  • affected 12.2(55)SE1
  • affected 12.2(58)SE1
  • affected 12.2(55)SE4
  • affected 12.2(58)SE2
  • affected 12.2(55)SE5
  • affected 12.2(55)SE6
  • affected 12.2(55)SE7
  • affected 12.2(55)SE8
  • and 714 more
Cisco Cisco IOS XE Software
  • affected 3.5.0E
  • affected 3.5.1E
  • affected 3.5.2E
  • affected 3.5.3E
  • affected 3.6.0E
  • affected 3.6.1E
  • affected 3.6.2aE
  • affected 3.6.2E
  • affected 3.6.3E
  • affected 3.6.4E
  • affected 3.6.5E
  • affected 3.6.6E
  • and 337 more
Cisco Cisco IOS XE Catalyst SD-WAN
  • affected 16.9.1
  • affected 16.9.2
  • affected 16.9.3
  • affected 16.9.4
  • affected 16.10.1
  • affected 16.10.2
  • affected 16.10.3
  • affected 16.10.3a
  • affected 16.10.3b
  • affected 16.10.4
  • affected 16.10.5
  • affected 16.10.6
  • and 9 more
Identifiers
CVE-2025-20352
CNA
cisco
Weakness (CWE)
CWE-121
Tags
Published
24 Sept 2025
Updated
26 Feb 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.7 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H CNA (cisco)
  • CISA KEV Listed since 29 Sept 2025: known to be exploited.
  • EPSS 0.41, the 98th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 24 Sept 2025. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.