CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability

CVE-2023-20109 · Severity: critical · CVSS 6.6 · Exploited in the wild · Published 2023-10-10

An out-of-bounds write vulnerability in the Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS and IOS XE Software allows authenticated remote attackers with administrative control of a key server or group member to execute arbitrary code or cause a denial of service. The flaw stems from insufficient validation of attributes in the GDOI and G-IKEv2 protocols.

Technologies: Cisco IOS, Cisco IOS XE, Cisco IOS XR. Vendors: Cisco.

Quick answers

Is CVE-2023-20109 exploited in the wild?
Yes. CVE-2023-20109 is known to be exploited in the wild, first recorded on 10 October 2023. Treat it as urgent.
How severe is CVE-2023-20109?
Critical severity, with a CVSS score of 6.6, published 10 October 2023.
Which products and versions are affected?
Cisco IOS 12.4(22)md, 12.4(22)md1, 12.4(22)md2, 12.4(22)mda, 12.4(22)mda1; Cisco IOS XE.
Is there a fix for CVE-2023-20109?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-20109 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2023-20109?
Check whether you run Cisco IOS, Cisco IOS XE or Cisco IOS XR. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Cisco IOS 12.4(22)md, 12.4(22)md1, 12.4(22)md2, 12.4(22)mda, 12.4(22)mda1
  • Cisco IOS XE

Timeline

  • 2023-10-10: disclosed
  • 2023-10-10: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2023-10-10: exploited: Reported as exploited in the wild at time of publication.

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