CVE-2026-20272

CVE CVE-2026-20272EUVD EUVD-2026-53458Published 2026-08-05T16:19:26.000ZLast changed 2026-08-06T03:55:48.000ZCVSS 9.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

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

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Cisco — IOS XE Software

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.