What’s Vulnerable › Vulnerabilities

CVE-2022-25219

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-10 · updated 2026-06-17

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).

Affected products

• Phicomm K2 Firmware: through 22.5.9.163
• Phicomm K2G Firmware: through 22.6.3.20
• Phicomm K2P Firmware: through 20.4.1.7
• Phicomm K3 Firmware: through 21.5.37.246
• Phicomm K3C Firmware: through 32.1.15.93

References

• https://www.tenable.com/security/research/tra-2022-01
• https://www.tenable.com/security/research/tra-2022-01

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