CVE-2023-20109

CRITICALNVD 6.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.6 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2%CVSS: 6.6Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.6
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
82%
KEV
⚠ Exploited

Published

September 27, 2023

Last Modified

October 28, 2025

Advisory Details (2)

Auto-updated Jun 12, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-20109
generic

Cisco IOS and IOS XE Software Cisco Group Encrypted Transport VPN Software Out-of-Bounds Write Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-getvpn-rce-g8qR68sx

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 55× in last 7d / 230× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 572 total refreshes for this CVE.

  1. 2026-08-11 03:09 UTCEG score recompute
  2. 2026-08-11 03:09 UTCGHSA enrichment
  3. 2026-08-10 22:56 UTCGHSA enrichment
  4. 2026-08-10 18:42 UTCGHSA enrichment
  5. 2026-08-10 14:28 UTCGHSA enrichment
  6. 2026-08-10 10:14 UTCGHSA enrichment
  7. 2026-08-10 06:01 UTCGHSA enrichment
  8. 2026-08-10 01:47 UTCGHSA enrichment
  9. 2026-08-09 21:34 UTCGHSA enrichment
  10. 2026-08-09 17:20 UTCGHSA enrichment
  11. 2026-08-09 13:07 UTCGHSA enrichment
  12. 2026-08-09 08:53 UTCGHSA enrichment
  13. 2026-08-09 04:39 UTCGHSA enrichment
  14. 2026-08-09 00:26 UTCGHSA enrichment
  15. 2026-08-08 20:12 UTCEG score recompute
  16. 2026-08-08 20:12 UTCGHSA enrichment
  17. 2026-08-08 16:34 UTCEPSS rescore
  18. 2026-08-08 15:58 UTCGHSA enrichment
  19. 2026-08-08 11:44 UTCGHSA enrichment
  20. 2026-08-08 07:30 UTCGHSA enrichment
  21. 2026-08-08 03:17 UTCGHSA enrichment
  22. 2026-08-07 23:03 UTCGHSA enrichment
  23. 2026-08-07 18:50 UTCEG score recompute
  24. 2026-08-07 18:50 UTCGHSA enrichment
  25. 2026-08-07 17:09 UTCCISA KEV update
Show 75 more
  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-07 14:36 UTCGHSA enrichment
  3. 2026-08-07 10:23 UTCGHSA enrichment
  4. 2026-08-07 06:09 UTCGHSA enrichment
  5. 2026-08-07 01:55 UTCGHSA enrichment
  6. 2026-08-06 21:42 UTCGHSA enrichment
  7. 2026-08-06 17:28 UTCEG score recompute
  8. 2026-08-06 17:28 UTCGHSA enrichment
  9. 2026-08-06 13:44 UTCEPSS rescore
  10. 2026-08-06 13:15 UTCGHSA enrichment
  11. 2026-08-06 09:01 UTCGHSA enrichment
  12. 2026-08-06 04:48 UTCGHSA enrichment
  13. 2026-08-06 00:34 UTCGHSA enrichment
  14. 2026-08-05 20:21 UTCEG score recompute
  15. 2026-08-05 20:21 UTCGHSA enrichment
  16. 2026-08-05 19:15 UTCEPSS rescore
  17. 2026-08-05 17:25 UTCCISA KEV update
  18. 2026-08-05 16:07 UTCGHSA enrichment
  19. 2026-08-05 11:54 UTCGHSA enrichment
  20. 2026-08-05 07:39 UTCGHSA enrichment
  21. 2026-08-05 03:25 UTCGHSA enrichment
  22. 2026-08-04 23:11 UTCGHSA enrichment
  23. 2026-08-04 18:58 UTCEG score recompute
  24. 2026-08-04 18:58 UTCGHSA enrichment
  25. 2026-08-04 17:02 UTCCISA KEV update
  26. 2026-08-04 15:07 UTCEPSS rescore
  27. 2026-08-04 14:44 UTCEG score recompute
  28. 2026-08-04 14:44 UTCGHSA enrichment
  29. 2026-08-04 10:35 UTCEPSS rescore
  30. 2026-08-04 10:29 UTCGHSA enrichment
  31. 2026-08-04 06:13 UTCGHSA enrichment
  32. 2026-08-04 01:58 UTCGHSA enrichment
  33. 2026-08-03 21:45 UTCGHSA enrichment
  34. 2026-08-03 19:22 UTCCISA KEV update
  35. 2026-08-03 17:31 UTCGHSA enrichment
  36. 2026-08-03 13:17 UTCEG score recompute
  37. 2026-08-03 13:17 UTCGHSA enrichment
  38. 2026-08-03 10:34 UTCEPSS rescore
  39. 2026-08-03 09:02 UTCGHSA enrichment
  40. 2026-08-03 04:49 UTCGHSA enrichment
  41. 2026-08-03 00:35 UTCGHSA enrichment
  42. 2026-08-02 20:21 UTCGHSA enrichment
  43. 2026-08-02 16:08 UTCGHSA enrichment
  44. 2026-08-02 11:54 UTCGHSA enrichment
  45. 2026-08-02 07:41 UTCGHSA enrichment
  46. 2026-08-02 03:27 UTCEG score recompute
  47. 2026-08-02 03:27 UTCGHSA enrichment
  48. 2026-08-02 02:24 UTCEPSS rescore
  49. 2026-08-02 02:24 UTCEPSS rescore
  50. 2026-08-01 23:13 UTCGHSA enrichment
  51. 2026-08-01 19:00 UTCGHSA enrichment
  52. 2026-08-01 14:46 UTCGHSA enrichment
  53. 2026-08-01 10:32 UTCGHSA enrichment
  54. 2026-08-01 06:18 UTCEG score recompute
  55. 2026-08-01 06:18 UTCGHSA enrichment
  56. 2026-08-01 04:13 UTCEPSS rescore
  57. 2026-08-01 02:02 UTCGHSA enrichment
  58. 2026-07-31 21:48 UTCGHSA enrichment
  59. 2026-07-31 17:33 UTCGHSA enrichment
  60. 2026-07-31 13:18 UTCGHSA enrichment
  61. 2026-07-31 09:05 UTCGHSA enrichment
  62. 2026-07-31 04:50 UTCGHSA enrichment
  63. 2026-07-31 00:36 UTCGHSA enrichment
  64. 2026-07-30 20:23 UTCEG score recompute
  65. 2026-07-30 20:23 UTCGHSA enrichment
  66. 2026-07-30 16:26 UTCEPSS rescore
  67. 2026-07-30 16:09 UTCGHSA enrichment
  68. 2026-07-30 11:55 UTCEG score recompute
  69. 2026-07-30 11:55 UTCGHSA enrichment
  70. 2026-07-30 07:39 UTCGHSA enrichment
  71. 2026-07-30 03:26 UTCEG score recompute
  72. 2026-07-30 03:26 UTCGHSA enrichment
  73. 2026-07-30 01:28 UTCEPSS rescore
  74. 2026-07-30 01:28 UTCEPSS rescore
  75. 2026-07-29 23:11 UTCGHSA enrichment

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Frequently asked(6)

What is CVE-2023-20109?
CVE-2023-20109 is a critical vulnerability published on September 27, 2023. 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…
When was CVE-2023-20109 disclosed?
CVE-2023-20109 was first published in the National Vulnerability Database on September 27, 2023, with the most recent update on October 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-20109 actively exploited?
Yes. CISA added CVE-2023-20109 to the Known Exploited Vulnerabilities catalog on October 10, 2023, affecting Cisco IOS and IOS XE. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-20109?
CVE-2023-20109 has a CVSS v3 base score of 6.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-20109?
CVE-2023-20109 affects Cisco IOS and IOS XE. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-20109?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20109, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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