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Exploited vulnerability · CISA KEV

Is CVE-2025-20352 exploited? Yes: in CISA KEV since 29 Sep 2025

Gociux · Cisco IOS and IOS XE · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-20352, Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 29 Sep 2025, 5 days after it was published. It affects Cisco IOS and IOS XE, an internet-facing product of the kind attackers use for initial access. 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 · 29 Sep 2025
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.7CVSS 3.1 · high
US federal due20 Oct 2025BOD 22-01 deadline

What it is

Cisco IOS and IOS XE contains a stack-based buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem that could allow for denial of service or remote code execution. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS and IOS XE
VulnerabilityCisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
WeaknessCWE-121
Published24 Sep 2025
Added to KEV29 Sep 2025
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS and IOS XE 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 24 Sep 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS and IOS XE

References

Questions

Is CVE-2025-20352 being exploited?

Yes. CISA added CVE-2025-20352 to the Known Exploited Vulnerabilities catalog on 29 Sep 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-20352 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-2025-20352?

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 IOS and IOS XE 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 September 2025 · Cisco scorecard · act-now radar.

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