A null byte interaction error has been discovered in the code that the telnetd_startup…
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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).
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Phicomm Routers | 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 | — | No fix listed | CNA |
- Phicomm Routers Vendor— 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 Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:phicomm:k2_firmware:*:*:*:*:*:*:*:* | up to 22.5.9.163 | Vulnerable | Phicomm |
| cpe:2.3:h:phicomm:k2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Phicomm |
| cpe:2.3:o:phicomm:k3_firmware:*:*:*:*:*:*:*:* | up to 21.5.37.246 | Vulnerable | Phicomm |
| cpe:2.3:h:phicomm:k3:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Phicomm |
| cpe:2.3:o:phicomm:k3c_firmware:*:*:*:*:*:*:*:* | up to 32.1.15.93 | Vulnerable | Phicomm |
| cpe:2.3:h:phicomm:k3c:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Phicomm |
| cpe:2.3:o:phicomm:k2g_firmware:*:*:*:*:*:*:*:* | up to 22.6.3.20 | Vulnerable | Phicomm |
| cpe:2.3:h:phicomm:k2g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Phicomm |
| cpe:2.3:o:phicomm:k2p_firmware:*:*:*:*:*:*:*:* | up to 20.4.1.7 | Vulnerable | Phicomm |
| cpe:2.3:h:phicomm:k2p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Phicomm |
- cpe:2.3:o:phicomm:k2_firmware:*:*:*:*:*:*:*:* Versions up to 22.5.9.163 Vulnerable ·Phicomm
- cpe:2.3:h:phicomm:k2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phicomm
- cpe:2.3:o:phicomm:k3_firmware:*:*:*:*:*:*:*:* Versions up to 21.5.37.246 Vulnerable ·Phicomm
- cpe:2.3:h:phicomm:k3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phicomm
- cpe:2.3:o:phicomm:k3c_firmware:*:*:*:*:*:*:*:* Versions up to 32.1.15.93 Vulnerable ·Phicomm
- cpe:2.3:h:phicomm:k3c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phicomm
- cpe:2.3:o:phicomm:k2g_firmware:*:*:*:*:*:*:*:* Versions up to 22.6.3.20 Vulnerable ·Phicomm
- cpe:2.3:h:phicomm:k2g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phicomm
- cpe:2.3:o:phicomm:k2p_firmware:*:*:*:*:*:*:*:* Versions up to 20.4.1.7 Vulnerable ·Phicomm
- cpe:2.3:h:phicomm:k2p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Phicomm
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2022-25219
- 2026-10-03 Alias added: GHSA-vh93-7ch4-7jjr
References
More Phicomm K2 Firmware vulnerabilities
- TI-2022-23797 Phicomm K2G v22.6.3.20 was discovered to store the root and admin passwords in plaintext. CVSS 3.1HIGH 7.5
- TI-2022-23795 Phicomm K2 v22.6.534.263 was discovered to store the root and admin passwords in plaintext. CVSS 3.1HIGH 7.5
- TI-2023-21549 Phicomm k2 v22.6.529.216 was discovered to contain a command injection vulnerability via the function luci.sys.call. CVSS 3.1HIGH 7.8
- TI-2022-23796 Phicomm K2G v22.6.3.20 was discovered to contain a command injection vulnerability via… CVSS 3.1HIGH 7.8
- TI-2022-23794 Phicomm K2 v22.6.534.263 was discovered to contain a command injection vulnerability via… CVSS 3.1HIGH 7.8
- TI-2022-08931 Broken or risky cryptographic algorithm in Phicomm Routers CVSS 3.1HIGH 8.1
Sources
- CVE-2022-25219 · CVE Program
- CVE-2022-25219 · NVD
- FIRST EPSS
- GHSA-vh93-7ch4-7jjr · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences