Path Traversal in Dovecot

CVE-2021-29157

Dovecot before 2.3.15 allows ../ Path Traversal. An attacker with access to the local filesystem can trick OAuth2 authentication into using an HS256 validation key from an attacker-controlled location. This occurs during use of local JWT validation with the posix fs driver.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.005 (38.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-29157?
CVE-2021-29157 is a high-severity vulnerability in Dovecot, classified under Path Traversal. CVSS score: 7.5/10. Published 2021-06-28.
How severe is CVE-2021-29157?
High severity. CVSS v3 base score is 7.5 out of 10.