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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (38.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Dovecot
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
References
- dovecot.org/security (Vendor Advisory)
- www.openwall.com/lists/oss-security/2021/06/28/1 (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202107-41 (vendor-advisory, Third Party Advisory)
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.