How severe is CVE-2025-20352?

CVE-2025-20352 has a CVSS score of 7.7/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-20352?

Affected package information for CVE-2025-20352 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2025-20352?

No fixed version has been published for CVE-2025-20352 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2025-20352 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2025-20352, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2025-20352?

CVE-2025-20352 has an EPSS (Exploit Prediction Scoring System) score of 4.0%, placing it in the 89th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2025-20352 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-20352 (Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-09-29. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-10-20. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-20352?

CVE-2025-20352 is classified as CWE-121 (CWE-121). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2025-20352?

CVE-2025-20352 affects cisco ios (726 versions, e.g. 12.2\(33\)sxi, 12.2\(33\)sxi1, 12.2\(33\)sxi2…); cisco ios xe (349 versions, e.g. 3.5.0e, 3.5.0sq, 3.5.1e…); cisco ios xe sd-wan (21 versions, e.g. 16.9.1, 16.9.2, 16.9.3…). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2025-20352 published, and has it been updated?

CVE-2025-20352 was published on September 24, 2025 and was last updated on October 28, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-09-29 — agencies required to remediate by 2025-10-20

CVE-2025-20352

HIGH

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker…

Published

Sep 24, 2025

Updated

Oct 28, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

4.0%probability of exploitation in next 30 days

Lower Risk89th percentile-0.25%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following:

An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisco IOS XE Software. To execute code as the root user, the attacker must have the SNMPv1 or v2c read-only community string or valid SNMPv3 user credentials and administrative or privilege 15 credentials on the affected device.

An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device over IPv4 or IPv6 networks.

This vulnerability is due to a stack overflow condition in the SNMP subsystem of the affected software. 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.

Note: This vulnerability affects all versions of SNMP.

Affected Products

3 products · 1096 configurations

ioscisco

726 versions

12.2\(33\)sxi12.2\(33\)sxi112.2\(33\)sxi212.2\(33\)sxi2a12.2\(33\)sxi312.2\(33\)sxi412.2\(33\)sxi4a12.2\(33\)sxi512.2\(33\)sxi612.2\(33\)sxi712.2\(33\)sxi812.2\(33\)sxi8a

ios xecisco

349 versions

3.5.0e3.5.0sq3.5.1e3.5.1sq3.5.2e3.5.2sq3.5.3e3.5.3sq3.5.4sq3.5.5sq3.5.6sq3.5.7sq

ios xe sd-wancisco

21 versions

16.9.116.9.216.9.316.9.416.10.116.10.216.10.316.10.3a16.10.3b16.10.416.10.516.10.6

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

scadastrangelove/CVE-2025-20352

CVE-2025-20352 SNMP Exposure Check (onesixtyone + parser)

⭐ 6🍴 2Feb 2026

Frequently Asked Questions

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisc

O3 Security · Impact-Aware SCA

Is CVE-2025-20352 in your stack?

O3 detects CVE-2025-20352 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works