CVE-2020-3259

CRITICALNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-02-15), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 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 verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 72%CVSS: 7.5Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · epss highExposed services: Not assessed

A fix is available — apply it.

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

CVSS v3
7.5
EG Score
9.0CRITICALhigh confidence
EG Risk
96
EG Risk 96/100CISA 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%
Automatability100% × 15%
CISA SSVC: Attend at low or medium mission impact; Act at high (mission-essential systems).
Action: A fix is available. Apply it sooner than your standard update timelines at low or medium mission impact and as soon as possible at high.
EPSS PROB
72%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCAttend at low or medium mission impact; Act at high (mission-essential systems).

A fix is available. Apply it sooner than your standard update timelines at low or medium mission impact and as soon as possible at high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

May 6, 2020

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Jun 6, 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-2020-3259
generic🔴 Active Exploitation

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 50× in last 7d / 233× 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 976 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-3259?
CVE-2020-3259 is a critical vulnerability published on May 6, 2020. A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential…
When was CVE-2020-3259 disclosed?
CVE-2020-3259 was first published on May 6, 2020, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-3259 actively exploited?
Yes. CISA added CVE-2020-3259 to the Known Exploited Vulnerabilities catalog on February 15, 2024, affecting Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2020-3259?
CVE-2020-3259 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2020-3259?
CVE-2020-3259 affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD).
How do I remediate CVE-2020-3259?
A fix for CVE-2020-3259 is available: update to the fixed version the vendor names in its advisory.

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