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.
Conclusion & alert: CVE-2013-0340 is rated High Exploit Risk (81.2/100): CVSS Medium severity, with high exploitation likelihood (EPSS 19.43%, 97th percentile). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +19.38% over the last day, indicating growing attacker interest. Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.05% | 19.43% | +19.38% |
| 2 | 2026-01-04 | 0.04% | 0.05% | +0.01% |
| 3 | 2026-01-01 | — | 0.04% | — |
Full EPSS history (12 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2013-0340 unimportant priority: Debian including 2 source packages (expat, libxmltok), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 3. | https://security-tracker.debian.org/tracker/CVE-2013-0340 |
gentoo
|
normal | CVE-2013-0340: 1 GLSA(s) (201701-21), 1 atom(s) (dev-libs/expat); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-0340 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2013-0340 |
suse
|
medium | CVE-2013-0340 severity moderate: SUSE including 276 source package names (13.2-9.1:libexpat1-2.7.1-slfo.1.1_1.1, 2.1.3-6.18:libexpat1-2.7.1-slfo.1.1_1.1, …), 310 product×package rows across 48 product lines (Container suse/sl-micro/6.0/baremetal-os-container, Container suse/sl-micro/6.0/base-os-container, … (48 product lines)): Known Affected 231, Fixed 79. | https://www.suse.com/security/cve/CVE-2013-0340/ |
ubuntu
|
medium | CVE-2013-0340 medium priority: Ubuntu including 40 source packages (apache2, apr-util, …), 280 status rows across 7 suites (hardy, lucid, oneiric, precise, quantal, raring, upstream): ignored 224, DNE 55, released 1. | https://ubuntu.com/security/CVE-2013-0340 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| libexpat_project | libexpat | < 2.4.0 | cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* |
| python | python | >= 3.6.0, < 3.6.15 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python | python | >= 3.7.0, < 3.7.12 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python | python | >= 3.8.0, < 3.8.12 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python | python | >= 3.9.0, < 3.9.7 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| apple | ipados | < 14.8 | cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* |
| apple | iphone_os | < 14.8 | cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* |
| apple | macos | < 11.6 | cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* |
| apple | tvos | < 15.0 | cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* |
| apple | watchos | < 8.0 | cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* |