CVE-2026-76504
cisco · published 2026-09-30
Source record Collected from the National Vulnerability Database (NVD)
CISA Known Exploited Vulnerabilities
CISA lists this CVE as known exploited (added 2026-09-30).
- CISA's name for it: Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
- CISA's description: Cisco Catalyst SD-WAN Manager contains a hex encoding vulnerability that could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user due to improper handling of URI encoding in an HTTP request.
- Known ransomware campaign use, per CISA: Unknown
Source: CISA KEV catalog (CC0 1.0).
Description
Description by Cisco Systems, Inc. via the CVE Program.
A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.
Status at the source
- NVD status: Analyzed
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Manager | 20.1.12: affected 19.2.1: affected 18.4.4: affected 18.4.5: affected 20.1.1.1: affected 20.1.1: affected 19.3.0: affected 19.2.2: affected 19.2.099: affected 18.3.6: affected 18.3.7: affected 19.2.0: affected 18.3.8: affected 19.0.0: affected 19.1.0: affected 18.4.302: affected 18.4.303: affected 19.2.097: affected 19.2.098: affected 17.2.10: affected 18.3.6.1: affected 19.0.1a: affected 18.2.0: affected 18.4.3: affected 18.4.1: affected 17.2.8: affected 18.3.3.1: affected 18.4.0: affected 18.3.1: affected 17.2.6: affected 17.2.9: affected 18.3.4: affected 17.2.5: affected 18.3.1.1: affected 18.3.5: affected 18.4.0.1: affected 18.3.3: affected 17.2.7: affected 17.2.4: affected 18.3.0: affected 19.2.3: affected 18.4.501_ES: affected 20.3.1: affected 20.1.2: affected 19.2.929: affected 19.2.31: affected 20.3.2: affected 19.2.32: affected 20.3.2_925: affected 20.3.2.1: affected |
Products named in NVD's CPE match criteria (1)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 9.8 CRITICAL — as published by Cisco Systems, Inc. (Secondary)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - SSVC — CISA's assessment (SSVC 2.0.3, CISA Coordinator): Exploitation: active · Automatable: yes · Technical impact: total
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76504
Source dates: published 2026-09-30, last changed 2026-10-03. DeSpy's copy of this version is dated 2026-10-03.
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