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Permalink CVE-2026-20272
9.8 CRITICAL
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): High (H)
  • Integrity (I): High (H)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): High (H)
created 1 month ago Activity log
  • Created & dismissed (no matching packages found) suggestion 1 month ago
Cisco IOS XE Software Security Hardening Release

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20272 are related to issues with improper neutralization of special elements that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-74.

Affected products

Cisco IOS XE Software
  • ==17.15.1y
  • ==17.3.1x
  • ==16.12.1z1
  • ==16.6.5b
  • ==16.12.9
  • ==16.9.2s
  • ==16.12.1s
  • ==17.18.1
  • ==17.15.4
  • ==16.6.5
  • ==17.12.1z2
  • ==17.12.1x
  • ==16.9.3h
  • ==16.9.7
  • ==17.1.2
  • ==16.8.1a
  • ==17.12.5
  • ==17.12.4b
  • ==17.7.1a
  • ==17.2.1
  • ==16.7.1
  • ==16.10.1a
  • ==16.12.4
  • ==17.3.1w
  • ==17.3.3
  • ==17.6.8
  • ==16.12.13
  • ==16.8.2
  • ==16.6.6
  • ==16.9.1b
  • ==17.10.1b
  • ==16.9.8
  • ==17.9.6a
  • ==17.11.1a
  • ==17.9.1
  • ==17.12.1z5
  • ==16.12.7
  • ==17.9.4a
  • ==16.12.5
  • ==17.6.1x
  • ==17.15.4a
  • ==16.10.3
  • ==17.12.7
  • ==16.10.1s
  • ==16.12.4a
  • ==17.2.1r
  • ==17.7.1b
  • ==17.12.3a
  • ==16.12.2a
  • ==17.3.6
  • ==16.12.2
  • ==17.4.2
  • ==17.9.5b
  • ==16.9.1d
  • ==17.9.1y1
  • ==17.1.1a
  • ==17.1.3
  • ==17.15.4b
  • ==16.11.1s
  • ==17.3.5a
  • ==16.12.1c
  • ==16.9.5
  • ==16.6.5a
  • ==17.18.3a
  • ==17.15.1b
  • ==17.12.4a
  • ==17.3.5
  • ==16.12.1t
  • ==16.6.4a
  • ==17.6.4
  • ==17.9.5d
  • ==17.12.1y
  • ==16.7.4
  • ==17.11.1
  • ==17.17.1
  • ==16.12.8
  • ==17.18.1y
  • ==16.9.8b
  • ==16.9.1a
  • ==17.9.5c
  • ==16.6.3
  • ==17.9.1w
  • ==17.9.7b
  • ==17.12.1
  • ==17.7.1
  • ==17.13.1a
  • ==17.9.2a
  • ==17.6.7
  • ==17.15.5
  • ==17.15.3a
  • ==17.3.8
  • ==17.4.1
  • ==17.4.1c
  • ==17.5.1a
  • ==17.9.3a
  • ==17.9.5a
  • ==17.3.2
  • ==17.15.2c
  • ==17.12.1z4
  • ==16.10.1c
  • ==17.14.1a
  • ==16.12.10a
  • ==16.9.3
  • ==17.1.1s
  • ==17.6.6a
  • ==17.3.4c
  • ==17.8.1
  • ==16.12.1z2
  • ==17.6.2
  • ==16.12.15
  • ==17.9.4
  • ==17.12.6a
  • ==17.3.1
  • ==17.4.1b
  • ==17.4.1a
  • ==17.18.3
  • ==17.12.3
  • ==17.15.4c
  • ==16.12.1w
  • ==16.12.1
  • ==16.12.6a
  • ==17.6.1z
  • ==17.12.1z
  • ==17.15.3b
  • ==16.9.6
  • ==16.12.1x
  • ==17.14.1
  • ==17.18.1a
  • ==16.6.8
  • ==17.15.1
  • ==17.6.3
  • ==17.12.5d
  • ==16.12.11
  • ==17.15.1x
  • ==17.3.1z
  • ==16.10.1
  • ==17.10.1a
  • ==16.6.4s
  • ==17.3.8a
  • ==17.9.7
  • ==17.9.5e
  • ==16.9.8a
  • ==16.8.1c
  • ==16.6.7a
  • ==16.9.3a
  • ==16.8.1e
  • ==16.10.2
  • ==16.6.9
  • ==17.2.1a
  • ==17.18.2
  • ==16.9.5f
  • ==17.1.1t
  • ==17.15.2b
  • ==17.18.1w
  • ==16.9.2
  • ==17.2.2
  • ==17.9.2
  • ==16.9.1
  • ==17.3.5b
  • ==16.9.4
  • ==17.12.6b
  • ==16.6.7
  • ==16.10.1e
  • ==17.6.1a
  • ==17.12.1z1
  • ==17.6.6
  • ==16.11.1b
  • ==16.8.1
  • ==16.11.2
  • ==17.15.2
  • ==17.18.1z
  • ==17.9.3
  • ==16.9.2a
  • ==17.6.1
  • ==17.12.1a
  • ==16.7.3
  • ==17.12.1z6
  • ==17.10.1
  • ==17.15.7
  • ==16.7.2
  • ==16.8.1b
  • ==16.10.1f
  • ==16.12.1z
  • ==17.15.4s1
  • ==17.3.2a
  • ==16.12.6
  • ==16.12.2t
  • ==17.7.2
  • ==16.12.2s
  • ==17.3.7
  • ==17.9.1x1
  • ==16.12.3
  • ==16.12.16
  • ==17.3.4b
  • ==16.6.2
  • ==17.15.5a
  • ==17.12.2
  • ==17.6.8a
  • ==17.9.7a
  • ==16.8.1d
  • ==16.12.1y
  • ==17.1.1
  • ==17.3.4
  • ==17.6.5a
  • ==17.12.5a
  • ==17.12.2a
  • ==16.11.1
  • ==17.6.5
  • ==17.15.3
  • ==17.15.1a
  • ==16.12.12
  • ==17.15.4d
  • ==17.12.7b
  • ==17.3.4a
  • ==16.9.3s
  • ==16.7.1a
  • ==16.12.3a
  • ==16.11.1c
  • ==17.3.3a
  • ==16.12.1a
  • ==17.9.1x
  • ==17.9.1a
  • ==17.8.1a
  • ==16.10.1b
  • ==16.9.1c
  • ==17.9.5f
  • ==17.6.1z1
  • ==16.12.14
  • ==16.11.1a
  • ==16.8.1s
  • ==17.12.1w
  • ==16.12.10
  • ==17.2.1v
  • ==16.6.10
  • ==17.12.6
  • ==17.9.8
  • ==17.4.2a
  • ==17.15.1w
  • ==17.15.2a
  • ==17.9.1y
  • ==16.12.5a
  • ==17.12.1z3
  • ==16.10.1g
  • ==17.2.3
  • ==16.8.3
  • ==17.16.1a
  • ==16.9.1s
  • ==16.12.5b
  • ==16.9.4c
  • ==16.6.4
  • ==17.12.5b
  • ==17.5.1
  • ==16.12.3s
  • ==17.12.5c
  • ==17.9.9
  • ==17.6.3a
  • ==17.12.7a
  • ==26.1.1a
  • ==17.12.4
  • ==26.1.1
  • ==17.9.5
  • ==17.3.1a
  • ==17.18.1x
  • ==17.16.1
  • ==17.9.6
  • ==17.13.1
  • ==16.10.1d
  • ==16.7.1b