CVE-2010-2621

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 10.5% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Trending — 3 sources updated this weekWeaponized
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 11%CVSS v2: 5.0Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

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

The QSslSocketBackendPrivate::transmit function in src_network_ssl_qsslsocket_openssl.cpp in Qt 4.6.3 and earlier allows remote attackers to cause a denial of service (infinite loop) via a malformed request.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
53(Track)
EG Risk 53/100SSVC: 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
Severity50% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
11%
EPSS %ILE
95%
KEV
Not listed

Published

July 2, 2010

Last Modified

April 29, 2026

References (18)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
debian:10qt4-x11 @ 4:4.6.3-2—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 29× 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. 2026-07-26 13:41 UTCEG score recompute▲ 5.00
  2. 2026-07-25 14:12 UTCEPSS rescore
  3. 2026-07-23 14:14 UTCEPSS rescore
  4. 2026-07-23 05:49 UTCOSV refresh
  5. 2026-07-23 01:02 UTCEG score recompute
  6. 2026-07-23 00:39 UTCEG score recompute
  7. 2026-07-23 00:06 UTCEG score recompute
  8. 2026-07-22 21:45 UTCEG score recompute
  9. 2026-07-22 14:03 UTCEPSS rescore
  10. 2026-07-22 14:03 UTCEPSS rescore
  11. 2026-07-21 15:20 UTCEPSS rescore
  12. 2026-07-20 17:03 UTCEPSS rescore
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  18. 2026-07-15 01:55 UTCEPSS rescore
  19. 2026-07-13 22:25 UTCEPSS rescore
  20. 2026-07-11 08:22 UTCEPSS rescore
  21. 2026-07-08 15:10 UTCEPSS rescore
  22. 2026-07-08 15:10 UTCEPSS rescore
  23. 2026-07-06 00:59 UTCOSV refresh
  24. 2026-07-05 02:26 UTCEPSS rescore
  25. 2026-07-02 14:01 UTCEPSS rescore
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  1. 2026-07-01 15:02 UTCEPSS rescore
  2. 2026-06-30 23:19 UTCEPSS rescore
  3. 2026-06-28 04:52 UTCEPSS rescore
  4. 2026-06-28 04:52 UTCEPSS rescore
  5. 2026-06-27 03:05 UTCEPSS rescore
  6. 2026-06-25 13:46 UTCEPSS rescore
  7. 2026-06-24 14:02 UTCEPSS rescore
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  9. 2026-06-23 21:30 UTCEPSS rescore
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  11. 2026-06-22 14:22 UTCEPSS rescore
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  13. 2026-06-21 14:53 UTCEPSS rescore
  14. 2026-06-19 19:22 UTCEPSS rescore
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  16. 2026-06-18 17:49 UTCEPSS rescore
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  18. 2026-06-17 17:49 UTCEPSS rescore
  19. 2026-06-17 17:49 UTCEPSS rescore
  20. 2026-06-17 12:05 UTCOSV refresh
  21. 2026-06-16 17:49 UTCEPSS rescore
  22. 2026-06-15 17:44 UTCEPSS rescore
  23. 2026-06-14 23:14 UTCEPSS rescore
  24. 2026-06-13 22:57 UTCEPSS rescore
  25. 2026-06-13 22:57 UTCEPSS rescore
  26. 2026-06-13 22:57 UTCEPSS rescore
  27. 2026-06-12 23:08 UTCEPSS rescore
  28. 2026-06-12 23:08 UTCEPSS rescore
  29. 2026-06-11 13:56 UTCEPSS rescore
  30. 2026-06-10 22:14 UTCEPSS rescore
  31. 2026-06-10 13:17 UTCEPSS rescore
  32. 2026-06-08 14:13 UTCEPSS rescore
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  35. 2026-06-05 06:07 UTCEPSS rescore
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  37. 2026-06-04 13:09 UTCEPSS rescore
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  39. 2026-06-02 20:10 UTCEPSS rescore
  40. 2026-06-02 20:10 UTCEPSS rescore
  41. 2026-06-01 13:49 UTCEPSS rescore
  42. 2026-06-01 13:49 UTCEPSS rescore
  43. 2026-05-31 22:28 UTCEPSS rescore
  44. 2026-05-31 22:28 UTCEPSS rescore
  45. 2026-05-31 00:14 UTCEPSS rescore
  46. 2026-05-31 00:13 UTCEPSS rescore
  47. 2026-05-29 13:40 UTCEPSS rescore
  48. 2026-05-29 11:02 UTCEG score recompute
  49. 2026-05-29 11:02 UTCGHSA enrichment
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-27 13:38 UTCEPSS rescore
  53. 2026-05-27 13:38 UTCEPSS rescore
  54. 2026-05-26 13:41 UTCEPSS rescore
  55. 2026-05-26 13:41 UTCEPSS rescore
  56. 2026-05-26 07:16 UTCEPSS rescore
  57. 2026-05-26 07:16 UTCEPSS rescore
  58. 2026-05-24 16:43 UTCEPSS rescore
  59. 2026-05-22 21:15 UTCEPSS rescore
  60. 2026-05-22 21:15 UTCEPSS rescore
  61. 2026-05-22 21:15 UTCEPSS rescore
  62. 2026-05-21 22:39 UTCEPSS rescore
  63. 2026-05-20 22:37 UTCEPSS rescore
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  66. 2026-05-20 11:21 UTCEPSS rescore
  67. 2026-05-20 11:21 UTCEPSS rescore
  68. 2026-05-18 21:29 UTCEPSS rescore
  69. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-14268✓ verified
    First seen Jul 8, 2010

    Qt 4.6.3 - 'QSslSocketBackendPrivate::transmit()' Denial of Service

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(4)

What is CVE-2010-2621?
CVE-2010-2621 is a medium vulnerability published on July 2, 2010. The QSslSocketBackendPrivate::transmit function in srcnetworksslqsslsocketopenssl.cpp in Qt 4.6.3 and earlier allows remote attackers to cause a denial of service (infinite loop) via a malformed request.
When was CVE-2010-2621 disclosed?
CVE-2010-2621 was first published in the National Vulnerability Database on July 2, 2010, 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-2010-2621 actively exploited?
CVE-2010-2621 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days, which ranks it in the top 4.7% of all scored CVEs.
How do I remediate CVE-2010-2621?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2010-2621, 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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