CVE-2023-20081

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2023-03-23. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.9Exploit: None knownExposed: 0

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

A vulnerability in the IPv6 DHCP (DHCPv6) client module of Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense (FTD) Software, Cisco IOS Software, and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of DHCPv6 messages. An attacker could exploit this vulnerability by sending crafted DHCPv6 messages to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: To successfully exploit this vulnerability, the attacker would need to either control the DHCPv6 server or be in a man-in-the-middle position.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: Track

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
Severity59% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

March 23, 2023

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 12, 2026
No patch confirmed yet.
generic

Cisco Adaptive Security Appliance Software, Firepower Threat Defense Software, IOS Software, and IOS XE Software IPv6 DHCP (DHCPv6) Client Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftdios-dhcpv6-cli-Zf3zTv

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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 160 total refreshes for this CVE.

  1. 2026-09-08 21:57 UTCEPSS rescore
  2. 2026-09-07 15:59 UTCEPSS rescore
  3. 2026-09-06 13:45 UTCEPSS rescore
  4. 2026-09-05 15:25 UTCEPSS rescore
  5. 2026-09-04 13:58 UTCEPSS rescore
  6. 2026-09-04 13:57 UTCEPSS rescore
  7. 2026-09-04 05:04 UTCEPSS rescore
  8. 2026-09-02 14:09 UTCEPSS rescore
  9. 2026-09-01 13:51 UTCEPSS rescore
  10. 2026-08-30 19:15 UTCEPSS rescore
  11. 2026-08-30 01:19 UTCEPSS rescore
  12. 2026-08-28 21:38 UTCEPSS rescore
  13. 2026-08-27 14:22 UTCEPSS rescore
  14. 2026-08-26 14:43 UTCEPSS rescore
  15. 2026-08-25 13:46 UTCEPSS rescore
  16. 2026-08-24 14:14 UTCEPSS rescore
  17. 2026-08-23 00:17 UTCEPSS rescore
  18. 2026-08-21 23:46 UTCEPSS rescore
  19. 2026-08-20 22:53 UTCEPSS rescore
  20. 2026-08-19 17:01 UTCEPSS rescore
  21. 2026-08-18 13:46 UTCEPSS rescore
  22. 2026-08-17 13:44 UTCEPSS rescore
  23. 2026-08-16 14:53 UTCEPSS rescore
  24. 2026-08-16 02:12 UTCEPSS rescore
  25. 2026-08-15 01:28 UTCEPSS rescore
Show 75 more
  1. 2026-08-15 01:27 UTCEPSS rescore
  2. 2026-08-13 21:58 UTCEPSS rescore
  3. 2026-08-12 13:48 UTCEPSS rescore
  4. 2026-08-11 19:57 UTCEG score recompute▼ 0.90
  5. 2026-08-11 19:57 UTCGHSA enrichment
  6. 2026-08-11 19:37 UTCNVD updateCVSS v3 → 5.9
  7. 2026-08-09 13:44 UTCEPSS rescore
  8. 2026-08-08 16:34 UTCEPSS rescore
  9. 2026-08-07 16:24 UTCEPSS rescore
  10. 2026-08-06 13:44 UTCEPSS rescore
  11. 2026-08-05 19:15 UTCEPSS rescore
  12. 2026-08-04 15:07 UTCEPSS rescore
  13. 2026-08-04 10:35 UTCEPSS rescore
  14. 2026-08-03 10:34 UTCEPSS rescore
  15. 2026-08-02 02:24 UTCEPSS rescore
  16. 2026-08-02 02:24 UTCEPSS rescore
  17. 2026-08-01 04:13 UTCEPSS rescore
  18. 2026-07-30 16:26 UTCEPSS rescore
  19. 2026-07-30 01:28 UTCEPSS rescore
  20. 2026-07-30 01:28 UTCEPSS rescore
  21. 2026-07-28 15:34 UTCEPSS rescore
  22. 2026-07-26 14:52 UTCEPSS rescore
  23. 2026-07-26 14:52 UTCEPSS rescore
  24. 2026-07-25 14:16 UTCEPSS rescore
  25. 2026-07-25 14:16 UTCEPSS rescore
  26. 2026-07-24 14:15 UTCEPSS rescore
  27. 2026-07-23 14:16 UTCEPSS rescore
  28. 2026-07-23 14:16 UTCEPSS rescore
  29. 2026-07-23 02:18 UTCEG score recompute
  30. 2026-07-22 23:05 UTCEG score recompute▲ 0.90
  31. 2026-07-22 14:06 UTCEPSS rescore
  32. 2026-07-21 15:23 UTCEPSS rescore
  33. 2026-07-20 17:05 UTCEPSS rescore
  34. 2026-07-19 14:29 UTCEPSS rescore
  35. 2026-07-19 14:29 UTCEPSS rescore
  36. 2026-07-19 02:27 UTCEPSS rescore
  37. 2026-07-19 02:27 UTCEPSS rescore
  38. 2026-07-18 10:03 UTCEPSS rescore
  39. 2026-07-18 10:03 UTCEPSS rescore
  40. 2026-07-16 17:01 UTCEPSS rescore
  41. 2026-07-16 17:01 UTCEPSS rescore
  42. 2026-07-15 16:56 UTCEPSS rescore
  43. 2026-07-15 01:58 UTCEPSS rescore
  44. 2026-07-15 01:58 UTCEPSS rescore
  45. 2026-07-13 22:28 UTCEPSS rescore
  46. 2026-07-13 22:28 UTCEPSS rescore
  47. 2026-07-13 06:11 UTCEPSS rescore
  48. 2026-07-12 05:45 UTCEPSS rescore
  49. 2026-07-12 05:45 UTCEPSS rescore
  50. 2026-07-11 08:25 UTCEPSS rescore
  51. 2026-07-11 08:25 UTCEPSS rescore
  52. 2026-07-09 19:08 UTCEPSS rescore
  53. 2026-07-08 15:13 UTCEPSS rescore
  54. 2026-07-07 13:44 UTCEPSS rescore
  55. 2026-07-06 16:26 UTCEPSS rescore
  56. 2026-07-06 16:25 UTCEPSS rescore
  57. 2026-07-06 02:21 UTCEPSS rescore
  58. 2026-07-05 02:28 UTCEPSS rescore
  59. 2026-07-04 06:29 UTCEPSS rescore
  60. 2026-07-04 06:29 UTCEPSS rescore
  61. 2026-07-02 16:58 UTCEPSS rescore
  62. 2026-07-01 15:04 UTCEPSS rescore
  63. 2026-06-30 23:21 UTCEPSS rescore
  64. 2026-06-29 14:04 UTCEPSS rescore
  65. 2026-06-28 14:06 UTCEPSS rescore
  66. 2026-06-28 14:06 UTCEPSS rescore
  67. 2026-06-28 04:54 UTCEPSS rescore
  68. 2026-06-28 04:54 UTCEPSS rescore
  69. 2026-06-27 03:07 UTCEPSS rescore
  70. 2026-06-25 13:48 UTCEPSS rescore
  71. 2026-06-25 13:48 UTCEPSS rescore
  72. 2026-06-24 14:03 UTCEPSS rescore
  73. 2026-06-24 14:03 UTCEPSS rescore
  74. 2026-06-23 21:31 UTCEPSS rescore
  75. 2026-06-23 21:31 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-20081?
CVE-2023-20081 is a medium vulnerability published on March 23, 2023. A vulnerability in the IPv6 DHCP (DHCPv6) client module of Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense (FTD) Software, Cisco IOS Software, and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on…
When was CVE-2023-20081 disclosed?
CVE-2023-20081 was first published in the National Vulnerability Database on March 23, 2023, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-20081 actively exploited?
CVE-2023-20081 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.9% of all scored CVEs.
What is the CVSS score of CVE-2023-20081?
CVE-2023-20081 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2023-20081?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20081, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2023-20081

Explore →

Is Your Infrastructure Affected by CVE-2023-20081?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs