CVE-2022-25219
A null byte interaction error has been discovered in the code that the telnetd_startup daemon uses to construct a pair of ephemeral…
- Published
- Updated
- Reserved
- Assigned by
- tenable
Description
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).
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.77% · top 44% of all CVEs (2 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Weakness
- Null Byte Interaction Error
Affected products
Phicomm Routers
- affected K3 >= 21.5.37.246, K3C >= 32.1.22.113, K2P >= 20.4.1.7, K2 A7 >= 22.6.506.28, K2G A1 >= 22.6.3.20
References (1)
- https://www.tenable.com/security/research/tra-2022-01 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Record last updated .