CVE-2025-20393

CRITICALNVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score elevated to 10.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-12-17), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 10.0 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
10.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 30%CVSS: 10.0Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

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

A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root privileges. This vulnerability is due to insufficient validation of HTTP requests by the Spam Quarantine feature. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with root privileges.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
100(Act)
EG Risk 100/100SSVC: Act

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
Severity100% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
30%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

December 17, 2025

Last Modified

January 16, 2026

Advisory Details (2)

Auto-updated Aug 1, 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-2025-20393
generic

Reports About Cyberattacks Against Cisco Secure Email Gateway And Cisco Secure Email and Web Manager

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 224× 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 484 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCStasonJatham/cisco-sa-sma-attack-N9bf4
    First seen Dec 18, 2025

    Script to detect CVE-2025-20393 for Cisco Secure Email Gateway And Cisco Secure Email and Web Manager

    Open source ↗
  • GitHub PoCcyberleelawat/CVE-2025-20393
    First seen Dec 18, 2025

    Cisco is aware of a potential vulnerability.  Cisco is currently investigating and will update these details as appropriate as more information becomes available.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2025-20393?
CVE-2025-20393 is a critical vulnerability published on December 17, 2025. A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root privileges. This vulnerability is due…
When was CVE-2025-20393 disclosed?
CVE-2025-20393 was first published in the National Vulnerability Database on December 17, 2025, with the most recent update on January 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-20393 actively exploited?
Yes. CISA added CVE-2025-20393 to the Known Exploited Vulnerabilities catalog on December 17, 2025, affecting Cisco Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-20393?
CVE-2025-20393 has a CVSS v3 base score of 10.0 (NVD).
Which products are affected by CVE-2025-20393?
CVE-2025-20393 affects Cisco Multiple Products. 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-2025-20393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-20393, 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-2025-20393

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