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01 Record

CVE-2026-20279

Cisco IOS XR Software Security Hardening Release: September 2026

CriticalPUBLISHEDCNA: cisco
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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02 Description

Cisco IOS XR Software Security Hardening Release: September 2026

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.49% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 41.8% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-09-18.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-02 16:13Z1 MO AGO
Last updated
2026-09-18 12:10Z1 MO AGO
Reserved
2025-10-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
Critical (CVSS 9.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-284Improper Access ControlPillar
Data version
5.2
Document digest
7c9d9a48243c866d8359a3959ead0dc048531506b85e29c7eaa754b0febfb4c5

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco IOS XR Software6.5.29, 7.0.1, 6.5.26, 6.5.25, 6.5.28, 6.5.90, 7.1.1, 7.0.90, 6.7.1, 7.0.2, 7.1.15, 7.2.1, 7.1.2, 6.7.2, 7.0.11, 7.0.12, 7.0.14, 7.1.25, 7.2.12, 7.3.1, 7.1.3, 6.7.3, 7.4.1, 7.2.2, 6.7.4, 6.5.31, 7.3.15, 7.3.16, 6.8.1, 7.4.15, 6.5.32, 7.3.2, 7.5.1, 7.4.16, 7.3.27, 7.6.1, 7.5.2, 7.8.1, 7.6.15, 7.5.12, 7.8.12, 7.3.3, 7.7.1, 6.8.2, 7.3.4, 7.4.2, 6.7.35, 6.9.1, 7.6.2, 7.5.3, 7.7.2, 6.9.2, 7.9.1, 7.10.1, 7.8.2, 7.5.4, 6.5.33, 7.8.22, 7.7.21, 7.9.2, 7.3.5, 7.5.5, 7.11.1, 7.9.21, 7.10.2, 24.1.1, 7.6.3, 7.3.6, 7.5.52, 7.11.2, 24.2.1, 24.1.2, 24.2.11, 24.3.1, 24.4.1, 24.2.2, 7.8.23, 7.11.21, 24.2.20, 24.3.2, 24.4.10, 6.5.35, 25.1.1, 24.4.2, 24.3.20, 24.4.15, 25.2.1, 6.5.351, 25.1.2, 24.3.30, 25.3.1, 6.5.352, 24.4.30, 24.2.21, 25.4.1, 25.2.2, 25.2.15, 7.2.0, 7.0.0, 25.2.30, 6.5.353, 26.1.1, 25.1.30, 25.3.15, 26.2.100, 25.4.2, 26.2.1, 25.4.30, 26.1.2, 25.4.201, 26.2.101, 25.2.21—

06 References