Threadlinqs IntelligenceStart free

Vendor200 products tracked

Cisco vulnerabilities & exploitation

19 in CISA KEV5 ransomware-linked8 with public exploit

As of 2026-10-05, Threadlinqs tracks 36 Cisco CVEs, 19 in the CISA Known Exploited Vulnerabilities catalog, 5 used in ransomware campaigns, linked to 70 tracked threat campaigns and 12 named threat actors.

CVEs
36Since 2008
CISA KEV
1953% of CVEs
Critical
16CVSS v3 9.0+
Avg CVSS
8.3/10Max 10
Threats
70Linked campaigns
Actors
12Named in campaigns

Data as of:

Exploitation timeline

Threadlinqs has recorded 36 Cisco CVEs published between and . The busiest month was 2026-02 (5 new CVEs). 19 of them (53%) are listed in CISA KEV, which means exploitation in the wild has been confirmed.

Most exploited vulnerabilities

Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 36 of 36 tracked Cisco CVEs.

Products affected

Threadlinqs normalises CPE and CNA product records across all 36 CVEs; 200 distinct Cisco products are affected. The most frequently affected (top 20):

  • Catalyst Sd-wan Manager 9 CVEs
  • Firepower Threat Defense 3 CVEs
  • ISE Passive Identity Connector 3 CVEs
  • Identity Services Engine Software 3 CVEs
  • Ios 3 CVEs
  • Unified Communications Manager 3 CVEs
  • Adaptive Security Appliance (ASA) Software 2 CVEs
  • Adaptive Security Appliance Software 2 CVEs
  • Firepower Threat Defense Software 2 CVEs
  • Sd-wan Vsmart Controller 2 CVEs
  • Secure Firewall Management Center (FMC) 2 CVEs
  • 1100 Integrated Services Router 1 CVE
  • 1100-4g Integrated Services Router 1 CVE
  • 1100-4p Integrated Services Router 1 CVE
  • 1100-6g Integrated Services Router 1 CVE
  • 1100-8p Integrated Services Router 1 CVE
  • 1101 Integrated Services Router 1 CVE
  • 1101-4p Integrated Services Router 1 CVE
  • 1109 Integrated Services Router 1 CVE
  • 1109-2p Integrated Services Router 1 CVE

Threat activity

70 tracked threat campaigns reference Cisco products or exploit Cisco CVEs; the 25 most recent are listed.

Threat actors targeting Cisco

Named threat actors attributed to campaigns that involve Cisco products or CVEs, with the number of linked campaigns:

How to prioritise Cisco patching

This order follows the data Threadlinqs holds for Cisco, not a generic severity checklist:

  • 19 of 36 Cisco CVEs (53%) are in CISA KEV: treat them as actively exploited and remediate them first, starting with CVE-2023-20198, CVE-2018-0171, CVE-2021-44228.
  • 5 CVEs are known to be used in ransomware campaigns; patch these ahead of other KEV entries on internet-facing systems.
  • Outside KEV, the highest EPSS scores are CVE-2025-20362 (50.7%), CVE-2025-20309 (1.1%), CVE-2026-20200 (0.8%).
  • 16 CVEs score Critical and 12 High on CVSS v3 (maximum 10, average 8.3); sequence these after KEV and high-EPSS items.
  • 8 CVEs have a public exploit or proof of concept recorded, which shortens the time from disclosure to attack.

About this data

Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.