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Vulnerabilities

MediumKEV

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

CVE-2023-20109 · Cisco IOS · CVSS 6.6 · KEV

In brief

Severity · CVSS
Medium6.6CVSS 3.1, Medium
EPSS
2%
CISA KEV
Known exploited, listed since 10 Oct 2023
CERT-FR
No advisory or alert referenced in the catalog
Vendor
Cisco
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-787

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

50 branches without a precise fixed release

Cisco IOS

Source: CVE-2023-20109cisco-sa-getvpn-rce-g8qR68sx

  1. 15.9
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  2. 15.8
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  3. 15.7
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  4. 15.6
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  5. 15.5
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  6. 15.4
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  7. 15.3
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  8. 15.2
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  9. 15.1
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  10. 15.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  11. 12.4
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed

The vendor states fixes are available; the releases per branch are in its advisory.

Cisco IOS XE Software

Source: CVE-2023-20109cisco-sa-getvpn-rce-g8qR68sx

  1. 17.11
    Affected versions17.11.1, 17.11.1a
    First fixed releaseNot published in the sources followed
  2. 17.10
    Affected versions17.10.1, 17.10.1a, 17.10.1b
    First fixed releaseNot published in the sources followed
  3. 17.9
    Affected versions17.9.1, 17.9.1a, 17.9.1w, 17.9.1x
    9 releases listed17.9.1, 17.9.1a, 17.9.1w, 17.9.1x, 17.9.1y, 17.9.2, 17.9.2a, 17.9.3, 17.9.3a
    First fixed releaseNot published in the sources followed
  4. 17.8
    Affected versions17.8.1, 17.8.1a
    First fixed releaseNot published in the sources followed
  5. 17.7
    Affected versions17.7.1, 17.7.1a, 17.7.1b, 17.7.2
    First fixed releaseNot published in the sources followed
  6. 17.6
    Affected versions17.6.1, 17.6.1a, 17.6.1w, 17.6.1x
    12 releases listed17.6.1, 17.6.1a, 17.6.1w, 17.6.1x, 17.6.1y, 17.6.1z, 17.6.2, 17.6.3, 17.6.3a, 17.6.4, 17.6.5, 17.6.5a
    First fixed releaseNot published in the sources followed
  7. 17.5
    Affected versions17.5.1, 17.5.1a, 17.5.1c
    First fixed releaseNot published in the sources followed
  8. 17.4
    Affected versions17.4.1, 17.4.1a, 17.4.1b, 17.4.2
    5 releases listed17.4.1, 17.4.1a, 17.4.1b, 17.4.2, 17.4.2a
    First fixed releaseNot published in the sources followed
  9. 17.3
    Affected versions17.3.1, 17.3.1a, 17.3.1w, 17.3.1x
    17 releases listed17.3.1, 17.3.1a, 17.3.1w, 17.3.1x, 17.3.1z, 17.3.2, 17.3.2a, 17.3.3, 17.3.4, 17.3.4a, 17.3.4b, 17.3.4c, 17.3.5, 17.3.5a, 17.3.5b, 17.3.6, 17.3.7
    First fixed releaseNot published in the sources followed
  10. 17.2
    Affected versions17.2.1, 17.2.1a, 17.2.1r, 17.2.1v
    6 releases listed17.2.1, 17.2.1a, 17.2.1r, 17.2.1v, 17.2.2, 17.2.3
    First fixed releaseNot published in the sources followed
  11. 17.1
    Affected versions17.1.1, 17.1.1a, 17.1.1s, 17.1.1t
    5 releases listed17.1.1, 17.1.1a, 17.1.1s, 17.1.1t, 17.1.3
    First fixed releaseNot published in the sources followed
  12. 16.12
    Affected versions16.12.1, 16.12.1a, 16.12.1c, 16.12.1s
    24 releases listed16.12.1, 16.12.1a, 16.12.1c, 16.12.1s, 16.12.1t, 16.12.1w, 16.12.1x, 16.12.1y, 16.12.2, 16.12.2a, 16.12.2s, 16.12.3, 16.12.3a, 16.12.3s, 16.12.4, 16.12.4a, 16.12.5, 16.12.5a, 16.12.5b, 16.12.6, 16.12.6a, 16.12.7, 16.12.8, 16.12.9
    First fixed releaseNot published in the sources followed
  13. 16.11
    Affected versions16.11.1, 16.11.1a, 16.11.1b, 16.11.1s
    5 releases listed16.11.1, 16.11.1a, 16.11.1b, 16.11.1s, 16.11.2
    First fixed releaseNot published in the sources followed
  14. 16.10
    Affected versions16.10.1, 16.10.1a, 16.10.1b, 16.10.1c
    11 releases listed16.10.1, 16.10.1a, 16.10.1b, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1s, 16.10.2, 16.10.3
    First fixed releaseNot published in the sources followed
  15. 16.9
    Affected versions16.9.1, 16.9.1a, 16.9.1b, 16.9.1s
    13 releases listed16.9.1, 16.9.1a, 16.9.1b, 16.9.1s, 16.9.2, 16.9.3, 16.9.3a, 16.9.4, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, 16.9.8
    First fixed releaseNot published in the sources followed
  16. 16.8
    Affected versions16.8.1, 16.8.1a, 16.8.1b, 16.8.1c
    9 releases listed16.8.1, 16.8.1a, 16.8.1b, 16.8.1c, 16.8.1d, 16.8.1e, 16.8.1s, 16.8.2, 16.8.3
    First fixed releaseNot published in the sources followed
  17. 16.7
    Affected versions16.7.1, 16.7.1a, 16.7.1b, 16.7.2
    6 releases listed16.7.1, 16.7.1a, 16.7.1b, 16.7.2, 16.7.3, 16.7.4
    First fixed releaseNot published in the sources followed
  18. 16.6
    Affected versions16.6.1, 16.6.2, 16.6.3, 16.6.4
    12 releases listed16.6.1, 16.6.2, 16.6.3, 16.6.4, 16.6.4a, 16.6.5, 16.6.5a, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10
    First fixed releaseNot published in the sources followed
  19. 16.5
    Affected versions16.5.1, 16.5.1a, 16.5.1b, 16.5.2
    5 releases listed16.5.1, 16.5.1a, 16.5.1b, 16.5.2, 16.5.3
    First fixed releaseNot published in the sources followed
  20. 16.4
    Affected versions16.4.1, 16.4.2, 16.4.3
    First fixed releaseNot published in the sources followed
  21. 16.3
    Affected versions16.3.1, 16.3.1a, 16.3.2, 16.3.3
    13 releases listed16.3.1, 16.3.1a, 16.3.2, 16.3.3, 16.3.4, 16.3.5, 16.3.5b, 16.3.6, 16.3.7, 16.3.8, 16.3.9, 16.3.10, 16.3.11
    First fixed releaseNot published in the sources followed
  22. 16.2
    Affected versions16.2.1, 16.2.2
    First fixed releaseNot published in the sources followed
  23. 16.1
    Affected versions16.1.1, 16.1.2, 16.1.3
    First fixed releaseNot published in the sources followed
  24. 3.18
    Affected versions3.18s, 3.18.1s, 3.18.2s, 3.18.3s
    5 releases listed3.18s, 3.18.1s, 3.18.2s, 3.18.3s, 3.18.4s
    First fixed releaseNot published in the sources followed
  25. 3.17
    Affected versions3.17s, 3.17.1s, 3.17.2s, 3.17.3s
    5 releases listed3.17s, 3.17.1s, 3.17.2s, 3.17.3s, 3.17.4s
    First fixed releaseNot published in the sources followed
  26. 3.16
    Affected versions3.16s, 3.16.1s, 3.16.2s, 3.16.3s
    11 releases listed3.16s, 3.16.1s, 3.16.2s, 3.16.3s, 3.16.4s, 3.16.5s, 3.16.6s, 3.16.7s, 3.16.8s, 3.16.9s, 3.16.10s
    First fixed releaseNot published in the sources followed
  27. 3.15
    Affected versions3.15s, 3.15.1s, 3.15.2s, 3.15.3s
    5 releases listed3.15s, 3.15.1s, 3.15.2s, 3.15.3s, 3.15.4s
    First fixed releaseNot published in the sources followed
  28. 3.14
    Affected versions3.14s, 3.14.1s, 3.14.2s, 3.14.3s
    5 releases listed3.14s, 3.14.1s, 3.14.2s, 3.14.3s, 3.14.4s
    First fixed releaseNot published in the sources followed
  29. 3.13
    Affected versions3.13s, 3.13.1s, 3.13.2s, 3.13.3s
    11 releases listed3.13s, 3.13.1s, 3.13.2s, 3.13.3s, 3.13.4s, 3.13.5s, 3.13.6s, 3.13.7s, 3.13.8s, 3.13.9s, 3.13.10s
    First fixed releaseNot published in the sources followed
  30. 3.12
    Affected versions3.12s, 3.12.1s, 3.12.2s, 3.12.3s
    5 releases listed3.12s, 3.12.1s, 3.12.2s, 3.12.3s, 3.12.4s
    First fixed releaseNot published in the sources followed
  31. 3.11
    Affected versions3.11e, 3.11s, 3.11.1e, 3.11.1s
    14 releases listed3.11e, 3.11s, 3.11.1e, 3.11.1s, 3.11.2e, 3.11.2s, 3.11.3e, 3.11.3s, 3.11.4e, 3.11.4s, 3.11.5e, 3.11.6e, 3.11.7e, 3.11.8e
    First fixed releaseNot published in the sources followed
  32. 3.10
    Affected versions3.10e, 3.10s, 3.10.1e, 3.10.1s
    15 releases listed3.10e, 3.10s, 3.10.1e, 3.10.1s, 3.10.2e, 3.10.2s, 3.10.3e, 3.10.3s, 3.10.4s, 3.10.5s, 3.10.6s, 3.10.7s, 3.10.8s, 3.10.9s, 3.10.10s
    First fixed releaseNot published in the sources followed
  33. 3.9
    Affected versions3.9e, 3.9s, 3.9.1e, 3.9.1s
    6 releases listed3.9e, 3.9s, 3.9.1e, 3.9.1s, 3.9.2e, 3.9.2s
    First fixed releaseNot published in the sources followed
  34. 3.8
    Affected versions3.8e, 3.8s, 3.8.1e, 3.8.1s
    14 releases listed3.8e, 3.8s, 3.8.1e, 3.8.1s, 3.8.2e, 3.8.2s, 3.8.3e, 3.8.4e, 3.8.5e, 3.8.6e, 3.8.7e, 3.8.8e, 3.8.9e, 3.8.10e
    First fixed releaseNot published in the sources followed
  35. 3.7
    Affected versions3.7s, 3.7.1s, 3.7.2s, 3.7.3s
    8 releases listed3.7s, 3.7.1s, 3.7.2s, 3.7.3s, 3.7.4s, 3.7.5s, 3.7.6s, 3.7.7s
    First fixed releaseNot published in the sources followed
  36. 3.6
    Affected versions3.6e, 3.6.1e, 3.6.2e, 3.6.3e
    11 releases listed3.6e, 3.6.1e, 3.6.2e, 3.6.3e, 3.6.4e, 3.6.5e, 3.6.6e, 3.6.7e, 3.6.8e, 3.6.9e, 3.6.10e
    First fixed releaseNot published in the sources followed
  37. 3.5
    Affected versions3.5e, 3.5.1e, 3.5.2e, 3.5.3e
    First fixed releaseNot published in the sources followed
  38. 3.4
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  39. 3.3
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed

The vendor states fixes are available; the releases per branch are in its advisory.

Remediation

Fix available

Vendor fix

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-getvpn-rce-g8qR68sx· revised 27 Sept 2023

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-getvpn-rce-g8qR68sx

CISA KEV required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA due date:

SourceCISA KEV

Last verified 1 Oct 2026 at 09:29 UTC

Known exploitation

Added to CISA KEV on 10 Oct 2023

Federal remediation due date: 31 Oct 2023

The CISA required action is shown under Remediation.

2% probability of exploitation in the next 30 days (percentile 84%).

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

CERT-FR

No CERT-FR advisory or alert of the last two years references this CVE, for the vendors Patcharo covers.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-getvpn-rce-g8qR68sx

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained