Vulnerability Details : 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 category: Directory traversal
Published 2021-06-28 12:15:09
Updated 2021-09-20 18:52:06
Source MITRE
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-29157

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 15 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-29157

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
2.1
 LOW AV:L/AC:L/Au:N/C:P/I:N/A:N
3.9
2.9
 nvd@nist.gov
7.5
 HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
1.1
5.8
 cve@mitre.org
5.5
 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
1.8
3.6
 nvd@nist.gov

CWE ids for CVE-2021-29157

  • The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-29157

Products affected by CVE-2021-29157

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