CVE-2003-1564

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2022-04-29. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs attack."

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
34
EG Risk 34/100CISA 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
Severity65% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
1.6%
EPSS %ILE
75th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

December 31, 2003

Last Modified

June 16, 2026

Advisory Details (5)

Auto-updated May 31, 2026
Patch available.
generic

Support

http://www.redhat.com/support/errata/RHSA-2008-0886.html
generic

About Secunia Research | Flexera

http://secunia.com/advisories/31868
generic

[xml] Security fix for libxml2

http://mail.gnome.org/archives/xml/2008-August/msg00034.html
generic

Client Challenge

http://xmlsoft.org/news.html
generic

Re: Elliotte Rusty Harold on Web Services

http://www.stylusstudio.com/xmldev/200302/post20020.html

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatlibxml2-0:2.4.19-11.ent2008-09-11redhat

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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 9× 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. 2026-10-10 19:53 UTCEPSS rescore
  2. 2026-10-09 19:58 UTCEPSS rescore
  3. 2026-10-08 16:28 UTCEPSS rescore
  4. 2026-10-07 23:35 UTCEPSS rescore
  5. 2026-10-06 15:08 UTCEPSS rescore
  6. 2026-10-05 17:36 UTCEPSS rescore
  7. 2026-10-03 14:19 UTCEPSS rescore
  8. 2026-09-29 02:39 UTCEG score recompute
  9. 2026-09-12 14:54 UTCEPSS rescore
  10. 2026-09-10 09:23 UTCEPSS rescore
  11. 2026-08-30 01:13 UTCEPSS rescore
  12. 2026-07-25 14:11 UTCEPSS rescore
  13. 2026-07-24 14:11 UTCEPSS rescore
  14. 2026-07-23 00:45 UTCEG score recompute
  15. 2026-07-23 00:27 UTCEG score recompute
  16. 2026-07-22 23:50 UTCEG score recompute
  17. 2026-07-22 21:30 UTCEG score recompute
  18. 2026-07-20 17:02 UTCEPSS rescore
  19. 2026-07-19 14:25 UTCEPSS rescore
  20. 2026-07-18 09:59 UTCEPSS rescore
  21. 2026-07-18 09:59 UTCEPSS rescore
  22. 2026-07-16 16:58 UTCEPSS rescore
  23. 2026-07-15 01:55 UTCEPSS rescore
  24. 2026-07-15 01:55 UTCEPSS rescore
  25. 2026-07-13 06:07 UTCEPSS rescore
Show 59 more
  1. 2026-07-11 08:22 UTCEPSS rescore
  2. 2026-07-11 08:22 UTCEPSS rescore
  3. 2026-07-08 15:09 UTCEPSS rescore
  4. 2026-07-06 02:19 UTCEPSS rescore
  5. 2026-07-04 06:26 UTCEPSS rescore
  6. 2026-07-02 14:00 UTCEPSS rescore
  7. 2026-06-28 14:02 UTCEPSS rescore
  8. 2026-06-28 04:52 UTCEPSS rescore
  9. 2026-06-27 03:04 UTCEPSS rescore
  10. 2026-06-23 21:29 UTCEPSS rescore
  11. 2026-06-21 14:52 UTCEPSS rescore
  12. 2026-06-21 01:56 UTCEPSS rescore
  13. 2026-06-19 19:22 UTCEPSS rescore
  14. 2026-06-19 19:22 UTCEPSS rescore
  15. 2026-06-18 17:49 UTCEPSS rescore
  16. 2026-06-18 17:49 UTCEPSS rescore
  17. 2026-06-17 17:49 UTCEPSS rescore
  18. 2026-06-17 17:49 UTCEPSS rescore
  19. 2026-06-16 17:49 UTCEPSS rescore
  20. 2026-06-16 17:49 UTCEPSS rescore
  21. 2026-06-15 17:43 UTCEPSS rescore
  22. 2026-06-14 23:13 UTCEPSS rescore
  23. 2026-06-14 23:13 UTCEPSS rescore
  24. 2026-06-13 22:56 UTCEPSS rescore
  25. 2026-06-12 23:08 UTCEPSS rescore
  26. 2026-06-11 13:55 UTCEPSS rescore
  27. 2026-06-10 22:13 UTCEPSS rescore
  28. 2026-06-10 13:17 UTCEPSS rescore
  29. 2026-06-08 14:13 UTCEPSS rescore
  30. 2026-06-05 22:43 UTCEPSS rescore
  31. 2026-06-05 22:43 UTCEPSS rescore
  32. 2026-06-05 06:07 UTCEPSS rescore
  33. 2026-06-04 13:09 UTCEPSS rescore
  34. 2026-06-02 20:10 UTCEPSS rescore
  35. 2026-06-01 13:49 UTCEPSS rescore
  36. 2026-06-01 13:49 UTCEPSS rescore
  37. 2026-05-31 22:28 UTCEPSS rescore
  38. 2026-05-31 16:41 UTCEG score recompute
  39. 2026-05-31 16:41 UTCVendor advisory
  40. 2026-05-31 16:41 UTCGHSA enrichment
  41. 2026-05-31 00:13 UTCEPSS rescore
  42. 2026-05-31 00:13 UTCEPSS rescore
  43. 2026-05-29 13:40 UTCEPSS rescore
  44. 2026-05-29 13:40 UTCEPSS rescore
  45. 2026-05-28 13:42 UTCEPSS rescore
  46. 2026-05-28 13:42 UTCEPSS rescore
  47. 2026-05-28 13:42 UTCEPSS rescore
  48. 2026-05-27 13:37 UTCEPSS rescore
  49. 2026-05-26 13:41 UTCEPSS rescore
  50. 2026-05-26 13:41 UTCEPSS rescore
  51. 2026-05-26 07:16 UTCEPSS rescore
  52. 2026-05-26 07:16 UTCEPSS rescore
  53. 2026-05-24 16:42 UTCEPSS rescore
  54. 2026-05-22 21:15 UTCEPSS rescore
  55. 2026-05-20 22:36 UTCEPSS rescore
  56. 2026-05-20 11:20 UTCEPSS rescore
  57. 2026-05-20 11:20 UTCEPSS rescore
  58. 2026-05-18 21:29 UTCEPSS rescore
  59. 2026-05-18 21:29 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2008:0886

Frequently asked(5)

What is CVE-2003-1564?
CVE-2003-1564 is a medium vulnerability published on December 31, 2003. libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs…
When was CVE-2003-1564 disclosed?
CVE-2003-1564 was first published on December 31, 2003, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2003-1564 actively exploited?
CVE-2003-1564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (75th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2003-1564?
CVE-2003-1564 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2003-1564?
A fix for CVE-2003-1564 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-2003-1564

Explore →

Is Your Infrastructure Affected by CVE-2003-1564?

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

Book a Demo →Browse All CVEs