What is CVE-2021-34429?

CVE-2021-34429 is a medium-severity vulnerability in Eclipse Jetty, classified under Information Disclosure. CVSS score: 5.3/10. Published 2021-07-15.

How severe is CVE-2021-34429?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2021-34429 known to be exploited?

29 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Eclipse Jetty

CVE-2021-34429

For Eclipse Jetty versions 9.4.37-9.4.42, 10.0.1-10.0.5 & 11.0.1-11.0.5, URIs can be crafted using some encoded characters to access the content of the WEB-INF directory and/or bypass some security constraints. This is a variation of the vulnerability reported in CVE-2021-28164/GHSA-v7ff-8wcx-gmc5.

Vulnerability class: Information Disclosure

Published 2021-07-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.993 (99.9th percentile), scored 2026-10-15.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.993 · newest: 0.993 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/eclipse/jetty.project/security/advisories/GHSA-vjv5-gp2w-65vm (Exploit, Third Party Advisory)
lists.apache.org/thread.html/r7dd079fa0ac6f47ba1ad0af98d7d0276547b8a4e005f034fb… (mailing-list)
lists.apache.org/thread.html/r90e7b4c42a96d74c219e448bee6a329ab0cd3205c44b63471… (mailing-list)
lists.apache.org/thread.html/r763840320a80e515331cbc1e613fa93f25faf62e991974171… (mailing-list)
lists.apache.org/thread.html/r2a3ea27cca2ac7352d392b023b72e824387bc9ff16ba245ec… (mailing-list)
lists.apache.org/thread.html/r8e6c116628c1277c3cf132012a66c46a0863fa2a3037c0707… (mailing-list)
lists.apache.org/thread.html/r029c0c6833c8bb6acb094733fd7b75029d633f47a92f1c9d1… (mailing-list)
lists.apache.org/thread.html/r46f748c1dc9cf9b6c1c18f6b5bfc3a869907f68f72e17666f… (mailing-list)
lists.apache.org/thread.html/rc26807be68748b3347decdcd03ae183622244b0b4cb09223d… (mailing-list)
lists.apache.org/thread.html/rb33d65c3e5686f2e3b9bb8a032a44163b2f2ad9d31a872733… (mailing-list)

Frequently asked questions

What is CVE-2021-34429?: CVE-2021-34429 is a medium-severity vulnerability in Eclipse Jetty, classified under Information Disclosure. CVSS score: 5.3/10. Published 2021-07-15.
How severe is CVE-2021-34429?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-34429 known to be exploited?: 29 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.