A null byte interaction error has been discovered in the code that the telnetd_startup daemon uses to construct a pair of ephemeral passwords that allow a user to spawn a telnet service on the router, and to ensure that the telnet service persists upon reboot. By means of a crafted exchange of UDP packets, an unauthenticated attacker on the local network can leverage this null byte interaction error in such a way as to make those ephemeral passwords predictable (with 1-in-94 odds). Since the attacker must manipulate data processed by the OpenSSL function RSA_public_decrypt(), successful exploitation of this vulnerability depends on the use of an unpadded RSA cipher (CVE-2022-25218).
Published 2022-03-10 17:47:02
Updated 2022-03-17 19:10:43
View at NVD,   CVE.org

Products affected by CVE-2022-25219

Exploit prediction scoring system (EPSS) score for CVE-2022-25219

0.13%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 49 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2022-25219

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.9
MEDIUM AV:L/AC:M/Au:N/C:C/I:C/A:C
3.4
10.0
NIST
8.4
HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.5
5.9
NIST

CWE ids for CVE-2022-25219

  • Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2022-25219

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