What is CVE-2021-29651?

CVE-2021-29651 is a medium-severity vulnerability in Pomerium, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-04-02.

How severe is CVE-2021-29651?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Pomerium

CVE-2021-29651

Pomerium before 0.13.4 has an Open Redirect (issue 1 of 2).

Vulnerability class: Open Redirect

Published 2021-04-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Pomerium

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

github.com/pomerium/pomerium/security/advisories/GHSA-35vc-w93w-75c2 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-29651?: CVE-2021-29651 is a medium-severity vulnerability in Pomerium, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-04-02.
How severe is CVE-2021-29651?: Medium severity. CVSS v3 base score is 6.1 out of 10.