CVE-2013-5537

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 1%CVSS: —Exploit: NoneExposed: 0

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

The web framework on Cisco Web Security Appliance (WSA), Email Security Appliance (ESA), and Content Security Management Appliance (SMA) devices does not properly manage the state of HTTP and HTTPS sessions, which allows remote attackers to cause a denial of service (management GUI outage) via multiple TCP connections, aka Bug IDs CSCuj59411, CSCuf89818, and CSCuh05635.

CVSS v3
—
EG Score
0.0(none)
EPSS
67.6%
KEV
Not listed

Published

October 24, 2013

Last Modified

April 29, 2026

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 40× 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.

  1. 2026-07-07 13:41 UTCEPSS rescore
  2. 2026-07-06 02:20 UTCEPSS rescore
  3. 2026-07-06 02:19 UTCEPSS rescore
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  10. 2026-06-28 14:03 UTCEPSS rescore
  11. 2026-06-28 04:53 UTCEPSS rescore
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  13. 2026-06-27 03:05 UTCEPSS rescore
  14. 2026-06-25 13:47 UTCEPSS rescore
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  16. 2026-06-24 14:02 UTCEPSS rescore
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  18. 2026-06-23 21:30 UTCEPSS rescore
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  20. 2026-06-22 14:22 UTCEPSS rescore
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  1. 2026-06-18 17:49 UTCEPSS rescore
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  3. 2026-06-17 17:49 UTCEPSS rescore
  4. 2026-06-17 17:49 UTCEPSS rescore
  5. 2026-06-16 17:49 UTCEPSS rescore
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  7. 2026-06-16 17:49 UTCEPSS rescore
  8. 2026-06-15 17:44 UTCEPSS rescore
  9. 2026-06-14 23:14 UTCEPSS rescore
  10. 2026-06-13 22:57 UTCEPSS rescore
  11. 2026-06-12 23:08 UTCEPSS rescore
  12. 2026-06-11 13:56 UTCEPSS rescore
  13. 2026-06-10 22:15 UTCEPSS rescore
  14. 2026-06-10 13:18 UTCEPSS rescore
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  17. 2026-06-06 13:45 UTCEPSS rescore
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  19. 2026-06-05 22:44 UTCEPSS rescore
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  21. 2026-06-05 06:08 UTCEPSS rescore
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  23. 2026-06-04 13:09 UTCEPSS rescore
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  25. 2026-06-02 20:10 UTCEPSS rescore
  26. 2026-06-02 20:10 UTCEPSS rescore
  27. 2026-06-01 13:49 UTCEPSS rescore
  28. 2026-06-01 13:49 UTCEPSS rescore
  29. 2026-05-31 22:28 UTCEPSS rescore
  30. 2026-05-31 22:28 UTCEPSS rescore
  31. 2026-05-31 00:14 UTCEPSS rescore
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  33. 2026-05-29 13:41 UTCEPSS rescore
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  35. 2026-05-28 21:50 UTCEG score recompute
  36. 2026-05-28 21:50 UTCGHSA enrichment
  37. 2026-05-28 13:42 UTCEPSS rescore
  38. 2026-05-28 13:42 UTCEPSS rescore
  39. 2026-05-28 13:42 UTCEPSS rescore
  40. 2026-05-27 13:38 UTCEPSS rescore
  41. 2026-05-27 13:38 UTCEPSS rescore
  42. 2026-05-26 13:41 UTCEPSS rescore
  43. 2026-05-26 13:41 UTCEPSS rescore
  44. 2026-05-26 07:16 UTCEPSS rescore
  45. 2026-05-26 07:16 UTCEPSS rescore
  46. 2026-05-24 16:43 UTCEPSS rescore
  47. 2026-05-22 21:15 UTCEPSS rescore
  48. 2026-05-22 21:15 UTCEPSS rescore
  49. 2026-05-22 21:15 UTCEPSS rescore
  50. 2026-05-21 22:39 UTCEPSS rescore
  51. 2026-05-20 22:37 UTCEPSS rescore
  52. 2026-05-20 22:37 UTCEPSS rescore
  53. 2026-05-20 11:21 UTCEPSS rescore
  54. 2026-05-20 11:21 UTCEPSS rescore
  55. 2026-05-18 21:29 UTCEPSS rescore
  56. 2026-05-18 21:29 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2013-5537?
CVE-2013-5537 is a none vulnerability published on October 24, 2013. The web framework on Cisco Web Security Appliance (WSA), Email Security Appliance (ESA), and Content Security Management Appliance (SMA) devices does not properly manage the state of HTTP and HTTPS sessions, which allows remote attackers to cause a denial of service (management GUI outage) via…
When was CVE-2013-5537 disclosed?
CVE-2013-5537 was first published in the National Vulnerability Database on October 24, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-5537 actively exploited?
CVE-2013-5537 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2013-5537?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-5537, 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.

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