Broken or risky cryptographic algorithm in Phicomm Routers
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-327.
Summary
The use of the RSA algorithm without OAEP, or any other padding scheme, in telnetd_startup, allows an unauthenticated attacker on the local area network to achieve a significant degree of control over the "plaintext" to which an arbitrary blob of ciphertext will be decrypted by OpenSSL's RSA_public_decrypt() function. This weakness allows the attacker to manipulate the various iterations of the telnetd startup state machine and eventually obtain a root shell on the device, by means of an exchange of crafted UDP packets. In all versions but K2 22.5.9.163 and K3C 32.1.15.93 a successful attack also requires the exploitation of a null-byte interaction error (CVE-2022-25219).
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 | K2 >= 22.5.9.163, K3 >= 21.5.37.246, K3C >= 32.1.15.93, K2P >= 20.4.1.7, K2 A7 >= 22.6.506.28 | — | No fix listed | CNA |
- Phicomm Routers Vendor— Affected K2 >= 22.5.9.163, K3 >= 21.5.37.246, K3C >= 32.1.15.93, K2P >= 20.4.1.7, K2 A7 >= 22.6.506.28 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-2022-25218
- 2026-10-03 Alias added: GHSA-j9f3-j4r5-j83v
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-2022-08932 A null byte interaction error has been discovered in the code that the telnetd_startup… CVSS 3.1HIGH 8.4
Sources
- CVE-2022-25218 · CVE Program
- CVE-2022-25218 · NVD
- FIRST EPSS
- GHSA-j9f3-j4r5-j83v · 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