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01 Record

CVE-2026-20271

Cisco IOS XE Software Security Hardening Release

HighPUBLISHEDCNA: cisco
CNA base score8.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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02 Description

Cisco IOS XE Software Security Hardening Release

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 ImpactpartialSuccessful exploitation gives limited 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
0.46% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 40.1% of scored records. A rank, not a probability.
NVD base score
8.6 (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:C/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-03.
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
2026-08-05 16:19Z2 MO AGO
Last updated
2026-10-02 23:23Z26 DAYS AGO
Reserved
2025-10-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
High (CVSS 8.6)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weaknesses
  • CWE-691Insufficient Control Flow ManagementPillar
Data version
5.2
Document digest
cb0b8111573c56f9534f0e87aa7d986790073850e400f2c37dc99950bdc4f518

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco IOS XE Software17.2.1a, 16.12.1y, 16.12.3s, 16.7.1b, 16.6.2, 16.6.5, 16.12.1w, 16.9.1d, 17.3.1, 16.9.4c, 16.7.1, 17.2.1, 16.6.8, 16.9.1b, 16.9.2s, 16.12.4, 16.12.3a, 17.1.1s, 16.11.1a, 16.7.2, 16.11.1b, 16.9.1s, 16.9.3h, 16.9.1c, 16.6.5a, 16.6.3, 16.10.1f, 17.2.1v, 16.8.1e, 16.9.3a, 16.12.1a, 16.12.1x, 16.6.4s, 16.10.1c, 16.12.3, 16.11.2, 16.6.5b, 16.12.2s, 16.10.1b, 16.7.3, 16.6.7, 16.9.6, 16.9.2, 16.10.1, 16.12.1t, 16.9.1, 16.8.1a, 16.9.3s, 16.6.7a, 16.12.2, 16.11.1, 16.9.3, 16.11.1s, 16.12.1, 17.1.1, 17.1.2, 16.10.1d, 17.1.1t, 16.9.4, 16.8.3, 16.12.2t, 16.9.5, 16.8.1s, 16.10.1e, 16.8.2, 16.6.4, 16.8.1b, 16.10.1a, 16.12.1z, 16.8.1c, 16.9.1a, 16.6.4a, 16.10.1g, 16.8.1, 16.6.6, 16.9.2a, 16.8.1d, 16.10.3, 16.7.1a, 16.11.1c, 16.10.1s, 17.2.1r, 17.1.1a, 16.10.2, 16.12.2a, 16.12.1c, 16.12.1s, 16.7.4, 17.2.2, 16.9.8, 16.9.7, 17.1.3, 17.3.1a, 17.3.2a, 16.12.5, 17.3.1w, 17.3.2, 17.4.1, 16.12.4a, 17.4.1a, 17.3.1x, 17.3.3, 16.6.9, 17.2.3, 17.5.1, 16.12.1z1, 16.12.5a, 17.4.1b, 17.3.1z, 16.12.5b, 17.4.2, 17.3.3a, 17.3.5, 17.3.4, 17.5.1a, 16.12.6, 17.6.1, 16.12.1z2, 16.6.10, 17.3.4a, 17.6.1a, 17.7.1, 17.6.1x, 17.6.2, 16.12.6a, 17.3.4c, 17.4.2a, 17.3.4b, 17.7.1a, 16.12.7, 17.8.1a, 17.6.3a, 17.6.3, 17.7.2, 17.7.1b, 17.9.1w, 17.3.5a, 17.6.1z, 16.12.8, 17.8.1, 17.9.1, 17.6.4, 17.3.5b, 17.9.1a, 17.3.6, 17.10.1, 16.9.8a, 17.6.1z1, 17.10.1a, 17.9.2, 17.6.5, 17.9.1x, 17.9.1y, 16.9.8b, 17.3.7, 17.9.2a, 17.9.3, 16.12.9, 17.11.1, 17.10.1b, 17.6.6, 17.9.1x1, 17.11.1a, 17.9.3a, 17.12.1, 17.3.8, 17.9.4, 16.12.10, 17.12.1w, 17.9.1y1, 17.12.1a, 17.9.5, 17.13.1, 17.12.1x, 17.12.2, 17.14.1, 17.9.4a, 17.3.8a, 17.6.6a, 17.6.5a, 17.6.7, 16.12.10a, 17.15.1, 17.13.1a, 17.12.2a, 16.12.11, 17.12.3, 17.12.1y, 17.12.1z, 17.9.5a, 17.14.1a, 17.9.5b, 17.6.8, 16.12.12, 17.12.4, 17.9.6, 17.17.1, 17.16.1, 17.15.1w, 17.12.3a, 17.9.5c, 17.15.1a, 17.12.1z1, 17.15.2, 17.15.1b, 17.9.5d, 17.15.1x, 17.9.6a, 17.12.1z2, 17.6.8a, 17.16.1a, 16.12.13, 17.15.3, 17.9.7, 17.12.5, 17.15.1y, 17.9.5e, 17.12.4a, 17.15.2a, 17.15.2c, 17.15.2b, 17.12.1z3, 17.9.5f, 17.12.4b, 17.12.5a, 17.18.1, 17.12.6, 17.12.1z4, 17.9.8, 17.9.7a, 17.15.3a, 17.15.4, 17.12.5b, 17.15.3b, 16.12.14, 17.18.1z, 17.9.7b, 17.12.5c, 26.1.1, 17.18.1a, 17.15.4a, 17.18.2, 17.18.1w, 17.15.4b, 17.12.6a, 17.12.7, 17.15.4c, 17.9.9, 17.12.5d, 16.12.15, 17.15.4s1, 17.15.5, 17.12.1z5, 17.18.1x, 17.12.1z6, 17.15.4d, 17.12.6b, 17.4.1c, 17.15.5a, 17.18.1y, 17.12.7a, 17.18.3, 17.12.7b, 17.18.3a, 26.1.1a, 17.15.7, 16.12.16, 17.18.5x, 26.1.3, 17.12.9, 17.18.5—

06 References