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14 results

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CVE-2025-20172

A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an…

Description

A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. For Cisco IOS and IOS XE Software, a successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. For Cisco IOS XR Software, a successful exploit could allow the attacker to cause the SNMP process to restart, resulting in an interrupted SNMP response from an affected device. Devices that are running Cisco IOS XR Software will not reload.  This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMP v2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMP v3, the attacker must have valid SNMP user credentials for the affected system.

Timeline

  1. ID reserved

    By cisco

  2. · 4 months later

    Published

  3. · 36 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-20172, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.76% · top 44% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.7.

Affected products

  • Cisco · IOS

    • affected 12.2(33)SRE1
    • affected 12.2(33)SRE2
    • affected 12.2(33)SRE3
    • affected 12.2(33)SRE4
    • affected 12.2(33)SRE
    • affected 12.2(33)SRE0a
    • affected 12.2(33)SRE5
    • affected 12.2(33)SRE6
    • affected 12.2(33)SRE8
    • affected 12.2(33)SRE7
    • affected 12.2(33)SRE9
    • affected 12.2(33)SRE7a
    • affected 12.2(33)SRE10
    • affected 12.2(33)SRE11
    • affected 12.2(33)SRE9a
    • affected 12.2(33)SRE12
    • affected 12.2(33)SRE13
    • affected 12.2(33)SRE14
    • affected 12.2(33)SRE15
    • affected 12.2(33)SRE15a
    • affected 15.0(1)S2
    • affected 15.0(1)S1
    • affected 15.0(1)S
    • affected 15.0(1)S3a
    • affected 15.0(1)S4
    • affected 15.0(1)S5
    • affected 15.0(1)S4a
    • affected 15.0(1)S6
    • affected 15.2(1)S
    • affected 15.2(2)S
    • affected 15.2(1)S1
    • affected 15.2(4)S
    • affected 15.2(1)S2
    • affected 15.2(2)S1
    • affected 15.2(2)S2
    • affected 15.2(2)S0a
    • affected 15.2(2)S0c
    • affected 15.2(4)S1
    • affected 15.2(4)S4
    • affected 15.2(4)S6
    • and 638 more

  • Cisco · Cisco IOS XR Software

    • affected 7.0.1
    • affected 7.0.2
    • affected 7.0.12
    • affected 7.0.14
    • affected 7.1.1
    • affected 7.1.15
    • affected 7.1.2
    • affected 7.1.3
    • affected 7.2.0
    • affected 7.2.1
    • affected 7.2.2
    • affected 7.3.1
    • affected 7.3.15
    • affected 7.3.2
    • affected 7.3.3
    • affected 7.3.5
    • affected 7.3.6
    • affected 7.4.1
    • affected 7.4.2
    • affected 7.5.1
    • affected 7.5.3
    • affected 7.5.2
    • affected 7.5.4
    • affected 7.5.5
    • affected 7.6.1
    • affected 7.6.2
    • affected 7.7.1
    • affected 7.7.2
    • affected 7.7.21
    • affected 7.8.1
    • affected 7.8.2
    • affected 7.9.1
    • affected 7.9.2
    • affected 7.9.21
    • affected 7.10.1
    • affected 7.10.2
    • affected 7.11.1
    • affected 7.11.2
    • affected 7.11.21
    • affected 24.1.1
    • and 8 more

  • Cisco · Cisco IOS XE Software

    • affected 3.7.0S
    • affected 3.7.1S
    • affected 3.7.2S
    • affected 3.7.3S
    • affected 3.7.4S
    • affected 3.7.5S
    • affected 3.7.6S
    • affected 3.7.7S
    • affected 3.7.4aS
    • affected 3.7.2tS
    • affected 3.7.0bS
    • affected 3.7.1aS
    • affected 3.3.0SG
    • affected 3.3.2SG
    • affected 3.3.1SG
    • affected 3.8.0S
    • affected 3.8.1S
    • affected 3.8.2S
    • affected 3.9.1S
    • affected 3.9.0S
    • affected 3.9.2S
    • affected 3.9.1aS
    • affected 3.9.0aS
    • affected 3.2.0SE
    • affected 3.2.1SE
    • affected 3.2.2SE
    • affected 3.2.3SE
    • affected 3.3.0SE
    • affected 3.3.1SE
    • affected 3.3.2SE
    • affected 3.3.3SE
    • affected 3.3.4SE
    • affected 3.3.5SE
    • affected 3.4.0SG
    • affected 3.4.2SG
    • affected 3.4.1SG
    • affected 3.4.3SG
    • affected 3.4.4SG
    • affected 3.4.5SG
    • affected 3.4.6SG
    • and 386 more

What to do

Exploitation: The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2025-20172 badge
[![CVE-2025-20172](https://cveledger.app/badge/CVE-2025-20172.svg)](https://cveledger.app/cve/CVE-2025-20172)

Record last updated .