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CVE-2025-20352

Stack-based Buffer Overflow

CVSS 3.1 High 7.7Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

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.

Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 7.7

Score published by cisco in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: Low

    A basic user account is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Changed

    The impact can reach other components beyond the vulnerable one.

  • Confidentiality impact: None

    No effect on the secrecy of data.

  • Integrity impact: None

    No effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.40575 (40.6% probability)
Percentile
98.7%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
Added to the catalog
Sep 29, 2025
Federal due date
Oct 20, 2025

CISA assessment as of Sep 27, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.

Affected products

Products listed in the CVE record, as the CNA published them.

  • Cisco IOS

    • affected: 12.2(55)SE
    • affected: 12.2(55)SE3
    • affected: 12.2(55)SE2
    • affected: 12.2(58)SE
    • affected: 12.2(55)SE1
    • affected: 12.2(58)SE1
    • affected: 12.2(55)SE4
    • affected: 12.2(58)SE2
    • affected: 12.2(55)SE5
    • affected: 12.2(55)SE6
    • affected: 12.2(55)SE7
    • affected: 12.2(55)SE8
    • affected: 12.2(55)SE9
    • affected: 12.2(55)SE10
    • affected: 12.2(55)SE11
    • affected: 12.2(55)SE12
    • affected: 12.2(55)SE13
    • affected: 12.2(58)EZ
    • affected: 12.2(53)EZ
    • affected: 12.2(55)EZ
    • affected: 12.2(60)EZ
    • affected: 12.2(60)EZ1
    • affected: 12.2(60)EZ2
    • affected: 12.2(60)EZ3
    • affected: 12.2(60)EZ4
    • and 701 more

  • Cisco IOS XE Software

    • affected: 3.5.0E
    • affected: 3.5.1E
    • affected: 3.5.2E
    • affected: 3.5.3E
    • affected: 3.6.0E
    • affected: 3.6.1E
    • affected: 3.6.2aE
    • affected: 3.6.2E
    • affected: 3.6.3E
    • affected: 3.6.4E
    • affected: 3.6.5E
    • affected: 3.6.6E
    • affected: 3.6.5aE
    • affected: 3.6.7E
    • affected: 3.6.8E
    • affected: 3.6.7bE
    • affected: 3.6.9E
    • affected: 3.6.10E
    • affected: 3.14.0S
    • affected: 3.14.1S
    • affected: 3.14.2S
    • affected: 3.14.3S
    • affected: 3.14.4S
    • affected: 3.15.0S
    • affected: 3.15.1S
    • and 324 more

  • Cisco IOS XE Catalyst SD-WAN

    • affected: 16.9.1
    • affected: 16.9.2
    • affected: 16.9.3
    • affected: 16.9.4
    • affected: 16.10.1
    • affected: 16.10.2
    • affected: 16.10.3
    • affected: 16.10.3a
    • affected: 16.10.3b
    • affected: 16.10.4
    • affected: 16.10.5
    • affected: 16.10.6
    • affected: 16.11.1a
    • affected: 16.12.1b
    • affected: 16.12.1d
    • affected: 16.12.1e
    • affected: 16.12.2r
    • affected: 16.12.3
    • affected: 16.12.4
    • affected: 16.12.4a
    • affected: 16.12.5

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:15 UTC. Sources and licenses