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01 Record

CVE-2026-20311

Cisco IOS XE Software Web UI Denial of Service Vulnerability

MediumPUBLISHEDCNA: cisco
CNA base score6.3 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
View raw JSON

02 Description

Cisco IOS XE Software Web UI Denial of Service Vulnerability

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.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • 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
0.25% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 16.5% of scored records. A rank, not a probability.
NVD base score
6.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-08-06.
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 16:32Z2 MO AGO
Last updated
2026-08-05 17:45Z2 MO AGO
Reserved
2025-10-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
Medium (CVSS 6.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Weaknesses
Data version
5.2
Document digest
da34fb067d87e4868ff88518b8630774d8ef6a6b11a842a28c9cf94edc5c55ce

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco IOS XE Software17.3.1, 17.3.1a, 17.3.2a, 17.3.1w, 17.3.2, 17.4.1, 17.4.1a, 17.3.1x, 17.3.3, 17.5.1, 17.4.1b, 17.3.1z, 17.4.2, 17.3.3a, 17.3.5, 17.3.4, 17.5.1a, 17.6.1, 17.3.4a, 17.6.1a, 17.7.1, 17.6.1x, 17.6.2, 17.3.4c, 17.4.2a, 17.3.4b, 17.7.1a, 17.8.1a, 17.6.3a, 17.6.3, 17.7.2, 17.7.1b, 17.9.1w, 17.3.5a, 17.6.1z, 17.8.1, 17.9.1, 17.6.4, 17.3.5b, 17.9.1a, 17.3.6, 17.10.1, 17.6.1z1, 17.10.1a, 17.9.2, 17.6.5, 17.9.1x, 17.9.1y, 17.3.7, 17.9.2a, 17.9.3, 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, 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, 17.15.1, 17.13.1a, 17.12.2a, 17.12.3, 17.12.1y, 17.12.1z, 17.9.5a, 17.14.1a, 17.9.5b, 17.6.8, 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, 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, 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, 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, 26.2.1ea—

06 References