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CVE-2026-20279 is a Cisco IOS XR Software hardening advisory identifier covering multiple internally discovered improper access-control vulnerabilities. The grouped issues include improper certificate validation, missing authentication for a critical function, missing authorization, and incorrect authorization. Cisco classifies the vulnerabilities as CWE-284. The assigned CVSS v3.1 vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, with a critical base score of 9.8.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical (CVSS 9.8) Cisco IOS XR improper-access-control vulnerability involving certificate-validation, authentication, and authorization failures.
A critical Cisco IOS XR improper-access-control vulnerability, rated CVSS 9.8, which Cisco patched as part of a set of flaws that could enable serious attacks including authentication bypass.
A CVE entry covering multiple internally discovered improper access-control issues in Cisco IOS XR Software. The listed CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network-reachable, low-complexity exploitation with no privileges or user interaction required and complete impact to confidentiality, integrity, and availability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.