Quagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 are affected by an absolute path traversal vulnerability that allows a remote, authenticated attacker to set the "message of the day" banner to any file on the system, allowing them to read all or some of the contents of those files. Such sensitive information as hashed credentials, hardcoded plaintext passwords for other services, configuration files, and private keys can be disclosed in this fashion. Improper handling of filenames that identify virtual resources, such as "/dev/urandom" allows an attacker to effect a denial of service attack against the command line interfaces of the Quagga services (zebra and ripd).
Published 2021-12-30 22:15:08
Updated 2022-01-12 20:03:49
View at NVD,   CVE.org
Vulnerability category: Directory traversalDenial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-20133

0.16%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 52 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20133

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.1
HIGH AV:A/AC:L/Au:S/C:C/I:N/A:C
5.1
9.2
NIST
6.1
MEDIUM CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
0.9
5.2
NIST

CWE ids for CVE-2021-20133

  • 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-2021-20133

Products affected by CVE-2021-20133

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