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01 Record

CVE-2026-20104

A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series

MediumPUBLISHEDCNA: cisco
CNA base score6.1 CVSS v3.xCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
View raw JSON

02 Description

A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series

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 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
0.16% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 4.8% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-28.
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
2026-03-25 16:05Z7 MO AGO
Last updated
2026-03-26 17:39Z7 MO AGO
Reserved
2025-10-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
Medium (CVSS 6.1)
CNA CVSS vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
  • CWE-124Buffer Underwrite ('Buffer Underflow')Base
Data version
5.2
Document digest
14086e805160528795cb611a0c670cf6704fca4ea340e6a355e85dea1115b255

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco IOS XE Software16.12.8, 16.12.6, 16.12.6a, 16.12.7, 17.3.3, 17.3.4, 17.3.5, 17.3.6, 17.3.4b, 17.3.7, 17.3.8, 17.3.8a, 17.4.1, 17.5.1, 17.6.1, 17.6.2, 17.6.3, 17.6.1y, 17.6.4, 17.6.5, 17.6.6, 17.6.6a, 17.6.5a, 17.6.7, 17.6.8, 17.7.1, 17.7.1a, 17.10.1, 17.8.1, 17.8.1a, 17.9.1, 17.9.2, 17.9.1a, 17.9.3, 17.9.4, 17.9.5, 17.9.4a, 17.9.5b, 17.9.6, 17.9.6a, 17.9.7, 17.9.8, 17.11.1, 17.12.1, 17.12.2, 17.12.3, 17.12.4, 17.12.5, 17.12.6, 17.13.1, 17.14.1, 17.15.1, 17.15.2, 17.15.3, 17.15.4, 17.16.1, 17.17.1, 17.18.1, 17.18.2—

06 References