CVE-2025-20352
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. High risk of service disruption.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- 2025-09-29 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- 2025-10-20 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 40.6% in the next 30 days (EPSS).
- Severity: 7.7 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Added to CISA KEV
- 2025-09-29
- Exploit probability
- 40.6% · EPSS, next 30 days
- Weakness
- CWE-121
- Record status
- Analyzed
Affected
- Cisco iOS Xe sd-wan 16.9.1
- Cisco iOS Xe sd-wan 16.9.2
- Cisco iOS Xe sd-wan 16.9.3
- Cisco iOS Xe sd-wan 16.9.4
- Cisco iOS Xe sd-wan 16.10.1
- Cisco iOS Xe sd-wan 16.10.2
- Cisco iOS Xe sd-wan 16.10.3
- Cisco iOS Xe sd-wan 16.10.3a
Attack profile CVSS 3.1 · 7.7
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2025-20352.md and follow it. Check whether this project is affected by CVE-2025-20352. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
