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 — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2.5%CVSS: 6.6Exploit: cisa kev · ssvc activeExposed services: Not assessed

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

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
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.
EPSS PROB
2.5%
EPSS %ILE
84th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 27, 2023

Last Modified

October 28, 2025

Advisory Details (2)

Auto-updated Jun 12, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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 53× in last 7d / 240× 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 1,052 total refreshes for this CVE.

  1. 2026-10-09 22:39 UTCEG score recompute
  2. 2026-10-09 22:39 UTCGHSA enrichment
  3. 2026-10-09 20:05 UTCEPSS rescore
  4. 2026-10-09 18:25 UTCGHSA enrichment
  5. 2026-10-09 14:10 UTCGHSA enrichment
  6. 2026-10-09 09:56 UTCGHSA enrichment
  7. 2026-10-09 05:41 UTCGHSA enrichment
  8. 2026-10-09 01:27 UTCGHSA enrichment
  9. 2026-10-08 21:13 UTCEG score recompute
  10. 2026-10-08 21:13 UTCGHSA enrichment
  11. 2026-10-08 17:05 UTCEPSS rescore
  12. 2026-10-08 17:00 UTCGHSA enrichment
  13. 2026-10-08 12:46 UTCGHSA enrichment
  14. 2026-10-08 08:31 UTCGHSA enrichment
  15. 2026-10-08 04:17 UTCGHSA enrichment
  16. 2026-10-08 00:03 UTCEG score recompute
  17. 2026-10-08 00:03 UTCGHSA enrichment
  18. 2026-10-07 23:45 UTCEPSS rescore
  19. 2026-10-07 19:50 UTCGHSA enrichment
  20. 2026-10-07 15:36 UTCGHSA enrichment
  21. 2026-10-07 11:22 UTCGHSA enrichment
  22. 2026-10-07 07:08 UTCGHSA enrichment
  23. 2026-10-07 02:54 UTCGHSA enrichment
  24. 2026-10-06 22:40 UTCGHSA enrichment
  25. 2026-10-06 18:26 UTCEG score recompute
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  1. 2026-10-06 18:26 UTCGHSA enrichment
  2. 2026-10-06 15:14 UTCEPSS rescore
  3. 2026-10-06 14:13 UTCGHSA enrichment
  4. 2026-10-06 09:59 UTCGHSA enrichment
  5. 2026-10-06 05:45 UTCGHSA enrichment
  6. 2026-10-06 01:31 UTCGHSA enrichment
  7. 2026-10-05 21:17 UTCEG score recompute
  8. 2026-10-05 21:17 UTCGHSA enrichment
  9. 2026-10-05 17:40 UTCEPSS rescore
  10. 2026-10-05 17:04 UTCGHSA enrichment
  11. 2026-10-05 12:50 UTCGHSA enrichment
  12. 2026-10-05 08:37 UTCGHSA enrichment
  13. 2026-10-05 04:23 UTCGHSA enrichment
  14. 2026-10-05 00:09 UTCEG score recompute
  15. 2026-10-05 00:08 UTCGHSA enrichment
  16. 2026-10-04 23:19 UTCEPSS rescore
  17. 2026-10-04 19:52 UTCGHSA enrichment
  18. 2026-10-04 15:39 UTCGHSA enrichment
  19. 2026-10-04 11:25 UTCGHSA enrichment
  20. 2026-10-04 07:12 UTCGHSA enrichment
  21. 2026-10-04 02:58 UTCGHSA enrichment
  22. 2026-10-03 22:45 UTCGHSA enrichment
  23. 2026-10-03 18:31 UTCEG score recompute
  24. 2026-10-03 18:31 UTCGHSA enrichment
  25. 2026-10-03 14:23 UTCEPSS rescore
  26. 2026-10-03 14:17 UTCGHSA enrichment
  27. 2026-10-03 10:03 UTCGHSA enrichment
  28. 2026-10-03 05:49 UTCGHSA enrichment
  29. 2026-10-03 01:35 UTCGHSA enrichment
  30. 2026-10-02 21:21 UTCGHSA enrichment
  31. 2026-10-02 17:07 UTCEG score recompute
  32. 2026-10-02 17:06 UTCGHSA enrichment
  33. 2026-10-02 16:23 UTCEPSS rescore
  34. 2026-10-02 12:52 UTCGHSA enrichment
  35. 2026-10-02 08:39 UTCGHSA enrichment
  36. 2026-10-02 04:25 UTCGHSA enrichment
  37. 2026-10-02 00:11 UTCGHSA enrichment
  38. 2026-10-01 19:57 UTCEG score recompute
  39. 2026-10-01 19:57 UTCGHSA enrichment
  40. 2026-10-01 19:47 UTCEPSS rescore
  41. 2026-10-01 15:44 UTCGHSA enrichment
  42. 2026-10-01 11:30 UTCGHSA enrichment
  43. 2026-10-01 07:17 UTCGHSA enrichment
  44. 2026-10-01 03:03 UTCGHSA enrichment
  45. 2026-09-30 22:49 UTCGHSA enrichment
  46. 2026-09-30 18:36 UTCEG score recompute
  47. 2026-09-30 18:35 UTCGHSA enrichment
  48. 2026-09-30 15:01 UTCEPSS rescore
  49. 2026-09-30 14:20 UTCGHSA enrichment
  50. 2026-09-30 10:05 UTCGHSA enrichment
  51. 2026-09-30 05:52 UTCGHSA enrichment
  52. 2026-09-30 01:36 UTCGHSA enrichment
  53. 2026-09-29 21:22 UTCGHSA enrichment
  54. 2026-09-29 17:08 UTCEG score recompute
  55. 2026-09-29 17:08 UTCGHSA enrichment
  56. 2026-09-29 15:16 UTCEPSS rescore
  57. 2026-09-29 12:55 UTCGHSA enrichment
  58. 2026-09-29 08:39 UTCGHSA enrichment
  59. 2026-09-29 04:26 UTCGHSA enrichment
  60. 2026-09-29 00:12 UTCEG score recompute
  61. 2026-09-29 00:12 UTCGHSA enrichment
  62. 2026-09-28 19:58 UTCGHSA enrichment
  63. 2026-09-28 15:43 UTCEG score recompute
  64. 2026-09-28 15:43 UTCGHSA enrichment
  65. 2026-09-28 11:29 UTCGHSA enrichment
  66. 2026-09-28 07:15 UTCGHSA enrichment
  67. 2026-09-28 03:02 UTCGHSA enrichment
  68. 2026-09-27 22:48 UTCGHSA enrichment
  69. 2026-09-27 21:51 UTCCISA KEV update
  70. 2026-09-27 18:34 UTCGHSA enrichment
  71. 2026-09-27 14:20 UTCEG score recompute
  72. 2026-09-27 14:20 UTCGHSA enrichment
  73. 2026-09-27 10:07 UTCGHSA enrichment
  74. 2026-09-27 05:53 UTCGHSA enrichment
  75. 2026-09-27 01:40 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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
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 (CRITICAL).
Which products are affected by CVE-2023-20109?
CVE-2023-20109 affects Cisco IOS and IOS XE.
How do I remediate CVE-2023-20109?
No fix for CVE-2023-20109 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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