Risk Letters

Exploited vulnerability

CVE-2026-76504

TLP:CLEAR

Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

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.

Facts

  • Vendor: Cisco
  • Product: Catalyst SD-WAN Manager
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 38.9 %
  • On CISA's Known Exploited Vulnerabilities list since: 30 September 2026
  • First known exploitation: 30 September 2026
  • CISA's deadline for US federal agencies: 3 October 2026
  • Weakness: CWE-177
  • First seen by Risk Letters: 30 September 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD