CVE-2020-3580

CRITICALNVD 6.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.1 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: 86%CVSS: 6.1Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

Multiple vulnerabilities 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 conduct cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

CVSS v3
6.1
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 or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
86%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

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

Exploitation active (CISA Vulnrichment) · Automatable no (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

October 21, 2020

Last Modified

August 11, 2026

Advisory Details (2)

Auto-updated Jun 13, 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-2020-3580
generic🔴 Active Exploitation

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-multiple-FCB3vPZe

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 46× in last 7d / 222× 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 917 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCcatatonicprime/CVE-2020-3580
    First seen Jul 15, 2022

    Additional exploits for XSS in Cisco ASA devices discovered by PTSwarm

    Open source ↗
  • GitHub PoCadarshvs/CVE-2020-3580
    First seen Jun 28, 2021

    Automated bulk IP or domain scanner for CVE 2020 3580. Cisco ASA and FTD XSS hunter.

    Open source ↗
  • GitHub PoCHudi233/CVE-2020-3580
    First seen Jun 25, 2021
    Open source ↗
  • Nucleihttp/cves/2020/CVE-2020-3580.yaml
    First seen Jan 1, 2020

    Cisco ASA/FTD Software - Cross-Site Scripting

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2020-3580?
CVE-2020-3580 is a critical vulnerability published on October 21, 2020. Multiple vulnerabilities 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 conduct cross-site scripting (XSS) attacks against a user of the web services interface of…
When was CVE-2020-3580 disclosed?
CVE-2020-3580 was first published on October 21, 2020, 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-2020-3580 actively exploited?
Yes. CISA added CVE-2020-3580 to the Known Exploited Vulnerabilities catalog on November 3, 2021, 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-2020-3580?
CVE-2020-3580 has a CVSS v3 base score of 6.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2020-3580?
CVE-2020-3580 affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD).
How do I remediate CVE-2020-3580?
A fix for CVE-2020-3580 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2020-3580

Explore →

Is Your Infrastructure Affected by CVE-2020-3580?

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

Book a Demo →Browse All CVEs