CVE-2013-0340

MEDIUMCVSS v2 · 6.86.8—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.8 — 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: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 20.1% 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
Elevated
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 19%CVSS v2: 6.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.

CVSS v2.0 (legacy)
6.8MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.8(low)
EG Risk
51(Track)
EG Risk 51/100SSVC: 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
Severity68% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
19%
EPSS %ILE
97%
KEV
Not listed

Published

January 21, 2014

Last Modified

April 29, 2026

References (49)

Vendor Advisories for CVE-2013-0340(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatexpat-0:2.2.10-1.el8_22025-12-09redhat
redhatexpat-0:2.2.10-1.el8_62025-12-09redhat
redhatexpat-0:2.2.10-1.el8_42025-12-04redhat
redhatexpat-0:2.2.10-1.el8_82025-12-02redhat
redhatexpat-0:2.2.10-12.el9_0.42025-11-25redhat
redhatexpat-0:2.5.0-1.el8_102025-11-19redhat
redhatexpat-0:2.4.9-1.el9_12022-11-15redhat

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.

Affected Packages

(6 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
expat2.2.10-2 ... 2.8.2-1~deb13u1 (47 versions)——
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
expat—2.4.1-2—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.1-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
expat—2.4.1-2—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

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 116 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
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  10. 2026-08-07 15:27 UTCOSV refresh
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  17. 2026-07-26 13:47 UTCEG score recompute▲ 6.80
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  20. 2026-07-23 01:09 UTCEG score recompute
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  23. 2026-07-22 14:04 UTCEPSS rescore
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  25. 2026-07-22 08:07 UTCOSV refresh
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  18. 2026-07-05 03:25 UTCOSV refresh
  19. 2026-07-05 02:26 UTCEPSS rescore
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  40. 2026-06-16 17:49 UTCEPSS rescore
  41. 2026-06-16 17:49 UTCEPSS rescore
  42. 2026-06-16 14:43 UTCOSV refresh
  43. 2026-06-15 17:44 UTCEPSS rescore
  44. 2026-06-14 23:14 UTCEPSS rescore
  45. 2026-06-13 22:57 UTCEPSS rescore
  46. 2026-06-12 23:08 UTCEPSS rescore
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  50. 2026-06-07 15:22 UTCEPSS rescore
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  67. 2026-05-28 20:44 UTCEG score recompute
  68. 2026-05-28 20:44 UTCVendor advisory
  69. 2026-05-28 20:43 UTCGHSA enrichment
  70. 2026-05-28 13:42 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2013-0340?
CVE-2013-0340 is a medium vulnerability published on January 21, 2014. expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a…
When was CVE-2013-0340 disclosed?
CVE-2013-0340 was first published in the National Vulnerability Database on January 21, 2014, 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-2013-0340 actively exploited?
CVE-2013-0340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19% probability of exploitation in the next 30 days, which ranks it in the top 2.8% of all scored CVEs.
How do I remediate CVE-2013-0340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-0340, 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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