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CVE-2023-20109

Out-of-bounds Write

CVSS 3.1 Medium 6.6Known exploited (CISA KEV)

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

Description

A vulnerability in the Cisco Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute arbitrary code on an affected device or cause the device to crash. This vulnerability is due to insufficient validation of attributes in the Group Domain of Interpretation (GDOI) and G-IKEv2 protocols of the GET VPN feature. An attacker could exploit this vulnerability by either compromising an installed key server or modifying the configuration of a group member to point to a key server that is controlled by the attacker. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a denial of service (DoS) condition. For more information, see the Details ["#details"] section of this advisory.

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 Medium 6.6

Score published by cisco in the CVE record.

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

  • Attack vector: Network

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

  • Attack complexity: High

    The attack depends on conditions outside the attacker's control, so it takes preparation.

  • Privileges required: High

    An account with significant privileges, such as an administrator, is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total 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
0.02504 (2.5% probability)
Percentile
84.9%
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 Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
Added to the catalog
Oct 10, 2023
Federal due date
Oct 31, 2023

CISA assessment as of Oct 23, 2024

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: 12.4(24)T
    • affected: 12.4(24)T3
    • affected: 12.4(22)T1
    • affected: 12.4(24)T5
    • affected: 12.4(24)T4
    • affected: 12.4(22)T
    • affected: 12.4(24)T8
    • affected: 12.4(24)T2
    • affected: 12.4(22)T5
    • affected: 12.4(22)T4
    • affected: 12.4(24)T1
    • affected: 12.4(24)T7
    • affected: 12.4(22)T3
    • affected: 12.4(24)T6
    • affected: 12.4(22)T2
    • affected: 12.4(24)T4a
    • affected: 12.4(24)T4b
    • affected: 12.4(24)T3e
    • affected: 12.4(24)T4c
    • affected: 12.4(24)T4d
    • affected: 12.4(24)T4e
    • affected: 12.4(24)T3f
    • affected: 12.4(24)T4f
    • affected: 12.4(24)T4l
    • affected: 12.4(24)MD1
    • and 649 more

  • 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: 3.4.0SG
    • affected: 3.4.2SG
    • and 339 more

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

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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, 19:24 UTC. Sources and licenses