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HIGH severity

CVE-2021-25951 — xml2dict

HIGH

CVE-2021-25951 is a high-severity (CVSS 7.5) XML External Entity (XXE) vulnerability in xml2dict. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

XML2Dict XML Entity Expansion Vulnerability

Also known asPYSEC-2021-349
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs66th percentile — riskier than 66% of all scored CVEsHighest risk
0.00%0.56%1.11%1.67%0.3%1.2%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-25951 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍xml2dict

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

XXE vulnerability in 'XML2Dict' version 0.2.2 allows an attacker to cause a denial of service. The parse function does not properly restrict recursive entity references.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐍PyPIxml2dictall versionsNo fix

Affected Products

1 product · 1 configurations
Application
xml2dictxml2dict_project
1 version
0.2.2
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

XXE vulnerability in 'XML2Dict' version 0.2.2 allows an attacker to caus…

whitesourcesoftware.comNVDJul 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for xml2dict, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of xml2dict has shipped for CVE-2021-25951 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

XXE vulnerability in 'XML2Dict' version 0.2.2 allows an attacker to cause a denial of service. The parse function does not properly restrict recursive entity references.
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CVE-2021-25951: xml2dict DoS (High 7.5)