CVE-2013-4371

MEDIUMCVSS v2 · 4.44.4—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 4.4 — 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:L/AC:M/Au:N/C:P/I:P/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 0.4% 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
4.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: 4.4Exploit: None knownExposed: 0

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

Use-after-free vulnerability in the libxl_list_cpupool function in the libxl toolstack library in Xen 4.2.x and 4.3.x, when running "under memory pressure," returns the original pointer when the realloc function fails, which allows local users to cause a denial of service (heap corruption and crash) and possibly execute arbitrary code via unspecified vectors.

CVSS v2.0 (legacy)
4.4MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
4.4(low)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity44% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

October 17, 2013

Last Modified

April 29, 2026

References (4)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xen—4.4.0-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
xen—4.4.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
xen—4.4.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
xen—4.4.0-1—

Data Freshness Timeline

(refreshed 5× in last 7d / 19× 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 118 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-20 22:50 UTCEPSS rescore
  3. 2026-08-19 16:59 UTCEPSS rescore
  4. 2026-08-18 13:42 UTCEPSS rescore
  5. 2026-08-16 02:09 UTCEPSS rescore
  6. 2026-08-15 01:25 UTCEPSS rescore
  7. 2026-08-12 13:45 UTCEPSS rescore
  8. 2026-08-09 13:42 UTCEPSS rescore
  9. 2026-08-08 16:31 UTCEPSS rescore
  10. 2026-08-07 17:19 UTCOSV refresh
  11. 2026-08-07 16:21 UTCEPSS rescore
  12. 2026-08-06 13:42 UTCEPSS rescore
  13. 2026-08-05 19:12 UTCEPSS rescore
  14. 2026-08-04 15:04 UTCEPSS rescore
  15. 2026-08-02 02:22 UTCEPSS rescore
  16. 2026-07-30 01:26 UTCEPSS rescore
  17. 2026-07-28 15:31 UTCEPSS rescore
  18. 2026-07-26 13:48 UTCEG score recompute▲ 4.40
  19. 2026-07-25 14:12 UTCEPSS rescore
  20. 2026-07-23 01:10 UTCEG score recompute
  21. 2026-07-23 00:14 UTCEG score recompute
  22. 2026-07-22 21:52 UTCEG score recompute
  23. 2026-07-22 14:04 UTCEPSS rescore
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-22 10:07 UTCOSV refresh
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  1. 2026-07-21 15:21 UTCEPSS rescore
  2. 2026-07-20 17:03 UTCEPSS rescore
  3. 2026-07-20 17:03 UTCEPSS rescore
  4. 2026-07-19 14:27 UTCEPSS rescore
  5. 2026-07-19 14:27 UTCEPSS rescore
  6. 2026-07-19 02:25 UTCEPSS rescore
  7. 2026-07-19 02:25 UTCEPSS rescore
  8. 2026-07-18 10:00 UTCEPSS rescore
  9. 2026-07-16 16:58 UTCEPSS rescore
  10. 2026-07-15 16:54 UTCEPSS rescore
  11. 2026-07-15 16:54 UTCEPSS rescore
  12. 2026-07-15 01:56 UTCEPSS rescore
  13. 2026-07-13 22:26 UTCEPSS rescore
  14. 2026-07-13 06:08 UTCEPSS rescore
  15. 2026-07-11 08:23 UTCEPSS rescore
  16. 2026-07-09 19:05 UTCEPSS rescore
  17. 2026-07-08 15:10 UTCEPSS rescore
  18. 2026-07-06 02:19 UTCEPSS rescore
  19. 2026-07-06 02:19 UTCEPSS rescore
  20. 2026-07-05 05:21 UTCOSV refresh
  21. 2026-07-05 02:26 UTCEPSS rescore
  22. 2026-07-04 06:27 UTCEPSS rescore
  23. 2026-07-01 15:02 UTCEPSS rescore
  24. 2026-06-30 23:19 UTCEPSS rescore
  25. 2026-06-30 23:19 UTCEPSS rescore
  26. 2026-06-29 14:02 UTCEPSS rescore
  27. 2026-06-28 14:03 UTCEPSS rescore
  28. 2026-06-28 04:53 UTCEPSS rescore
  29. 2026-06-28 04:53 UTCEPSS rescore
  30. 2026-06-27 03:05 UTCEPSS rescore
  31. 2026-06-25 13:46 UTCEPSS rescore
  32. 2026-06-24 14:02 UTCEPSS rescore
  33. 2026-06-24 14:02 UTCEPSS rescore
  34. 2026-06-23 21:30 UTCEPSS rescore
  35. 2026-06-22 14:22 UTCEPSS rescore
  36. 2026-06-22 14:22 UTCEPSS rescore
  37. 2026-06-21 14:53 UTCEPSS rescore
  38. 2026-06-21 01:57 UTCEPSS rescore
  39. 2026-06-21 01:56 UTCEPSS rescore
  40. 2026-06-19 19:23 UTCEPSS rescore
  41. 2026-06-19 19:22 UTCEPSS rescore
  42. 2026-06-18 17:49 UTCEPSS rescore
  43. 2026-06-18 17:49 UTCEPSS rescore
  44. 2026-06-17 17:49 UTCEPSS rescore
  45. 2026-06-17 17:49 UTCEPSS rescore
  46. 2026-06-16 17:49 UTCEPSS rescore
  47. 2026-06-16 17:49 UTCEPSS rescore
  48. 2026-06-16 16:39 UTCOSV refresh
  49. 2026-06-15 17:44 UTCEPSS rescore
  50. 2026-06-14 23:14 UTCEPSS rescore
  51. 2026-06-13 22:57 UTCEPSS rescore
  52. 2026-06-12 23:08 UTCEPSS rescore
  53. 2026-06-11 13:56 UTCEPSS rescore
  54. 2026-06-10 13:18 UTCEPSS rescore
  55. 2026-06-08 14:14 UTCEPSS rescore
  56. 2026-06-07 15:22 UTCEPSS rescore
  57. 2026-06-06 13:45 UTCEPSS rescore
  58. 2026-06-06 13:45 UTCEPSS rescore
  59. 2026-06-05 22:44 UTCEPSS rescore
  60. 2026-06-05 22:44 UTCEPSS rescore
  61. 2026-06-05 06:08 UTCEPSS rescore
  62. 2026-06-05 06:08 UTCEPSS rescore
  63. 2026-06-02 20:10 UTCEPSS rescore
  64. 2026-06-02 20:10 UTCEPSS rescore
  65. 2026-06-01 13:49 UTCEPSS rescore
  66. 2026-06-01 13:49 UTCEPSS rescore
  67. 2026-05-31 00:14 UTCEPSS rescore
  68. 2026-05-31 00:14 UTCEPSS rescore
  69. 2026-05-29 13:41 UTCEPSS rescore
  70. 2026-05-29 13:41 UTCEPSS rescore
  71. 2026-05-28 21:55 UTCEG score recompute
  72. 2026-05-28 21:55 UTCGHSA enrichment
  73. 2026-05-28 13:42 UTCEPSS rescore
  74. 2026-05-28 13:42 UTCEPSS rescore
  75. 2026-05-28 13:42 UTCEPSS rescore

Frequently asked(4)

What is CVE-2013-4371?
CVE-2013-4371 is a medium vulnerability published on October 17, 2013. Use-after-free vulnerability in the libxllistcpupool function in the libxl toolstack library in Xen 4.2.x and 4.3.x, when running "under memory pressure," returns the original pointer when the realloc function fails, which allows local users to cause a denial of service (heap corruption and crash)…
When was CVE-2013-4371 disclosed?
CVE-2013-4371 was first published in the National Vulnerability Database on October 17, 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-2013-4371 actively exploited?
CVE-2013-4371 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.4% of all scored CVEs.
How do I remediate CVE-2013-4371?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-4371, 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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