CVE-2025-20151: A vulnerability in the implementation of the Simple Network Management Protocol Version 3 (SNMPv3) feature of

Routine

MEDIUM 4.3MITIGATE

CVE-2025-20151 is a medium-severity flaw (CVSS 4.3) affecting ios xe sd-wan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the implementation of the Simple Network Management Protocol Version 3 (SNMPv3) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to poll an affected device using SNMP, even if the device is configured to deny SNMP traffic from an unauthorized source or the SNMPv3 username is removed from the configuration. This vulnerability exists because of the way that the SNMPv3 config

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-16, CWE-1284
Published	2025-05-07
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-07 18:15 UTCPublished CVE record published
2026-06-17 08:40 UTCUpdated Record last modified

cisco ios xe sd-wan MITIGATE

Affected: 16.9.1 · 16.9.2 · 16.9.3 · 16.9.4 · 16.10.1 · 16.10.2 · 16.10.3 · 16.10.3a

Fixed in: no fixed release known

Safe to downgrade to: a release before 16.9.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-20151?

ios xe sd-wan: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-20151 being exploited?

CVE-2025-20151 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-20151 affect?

CVE-2025-20151 affects ios xe sd-wan. Severity is medium (CVSS 4.3). A vulnerability in the implementation of the Simple Network Management Protocol Version 3 (SNMPv3) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to poll an affected device using SNMP,

How urgent is CVE-2025-20151?

Priority 24/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · Cisco IOS XE vulnerabilities · Cisco vulnerabilities

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References

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