All vulnerabilities
CVE-2026-76504

Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability

Cisco Catalyst SD-WAN ManagerNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationExploited in the wildAdded to KEV 30 Sep 2026CISA KEV
Exploit odds (EPSS)1.82%Chance of exploitation activity in the next 30 days, higher than 78% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline3 Oct 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 30 Sep 2026Added to CISA KEVCISA KEV
  2. 30 Sep 2026, 13:04 UTCPublishedCVE List
  3. 2 Oct 2026, 23:18 UTCFirst reportCisco PSIRT
  4. 23 Oct 2026, 17:25 UTCExploit code publicGitHub proof-of-concept repositories

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 30

  • Cisco Catalyst SD-WAN Manageraffected: 20.1.12CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.2.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.4CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.5CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 20.1.1.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 20.1.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.3.0CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.2.2CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.2.099CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.3.6CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.3.7CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.2.0CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.3.8CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.0.0CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.1.0CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.302CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.303CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.2.097CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.2.098CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 17.2.10CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.3.6.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 19.0.1aCVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.2.0CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.3CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 17.2.8CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.3.3.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.4.0CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 18.3.1CVE List
  • Cisco Catalyst SD-WAN Manageraffected: 17.2.6CVE List

References 3