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CVE-2021-3878

32
FAUCET Score

CVE-2021-3878 is a critical XML External Entity (XXE) vulnerability affecting Stanford CoreNLP, allowing for remote code execution, data exfiltration, and denial of service. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector and low attack complexity, requiring no user interaction or privileges. While there is no evidence of active exploitation, nor are there public exploits available in Metasploit or ExploitDB, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.3.1CPE matchmatch criteria
cpe:2.3:a:stanford:corenlp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 65th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: edu.stanford.nlp:stanford-corenlpFixed in: 4.3.1

Vendor Advisories (1)

mavenGHSA-5h9g-8xcv-qjq9critical

Improper Restriction of XML External Entity Reference in Stanford CoreNLP

May 24, 2022

References

github.com / stanfordnlp/corenlp/commit/e5bbe135a02a74b952396751ed3015e8b8252e99
PatchThird Party Advisory
huntr.dev / bounties/a11c889b-ccff-4fea-9e29-963a23a63dd2
ExploitPatchThird Party Advisory