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Exploited vulnerability · CISA KEV

Is CVE-2026-20045 exploited? Yes: in CISA KEV since 21 Jan 2026

Gociux · Cisco Unified Communications Manager · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-20045, Cisco Unified Communications Products Code Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 21 Jan 2026, the day it was published. It affects Cisco Unified Communications Manager. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 21 Jan 2026
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity8.2CVSS 3.1 · high
US federal due11 Feb 2026BOD 22-01 deadline

What it is

Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance contain a code injection vulnerability that could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.

VendorCisco (103 exploited CVEs in KEV)
ProductUnified Communications Manager
VulnerabilityCisco Unified Communications Products Code Injection Vulnerability
WeaknessCWE-94
Published21 Jan 2026
Added to KEV21 Jan 2026
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for Unified Communications Manager in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 21 Jan 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in Unified Communications Manager

References

Questions

Is CVE-2026-20045 being exploited?

Yes. CISA added CVE-2026-20045 to the Known Exploited Vulnerabilities catalog on 21 Jan 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-20045 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-20045?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Unified Communications Manager and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in January 2026 · Cisco scorecard · act-now radar.

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