{"id":"CVE-2022-25218","aliases":["EUVD-2022-29917","GHSA-j9f3-j4r5-j83v"],"status":"published","title":"The use of the RSA algorithm without OAEP, or any other padding scheme, in telnetd_startup,...","description":"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).","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.00993,"percentile":0.62825,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-327"],"published":"2022-03-07T21:50:25Z","modified":"2026-06-17T04:33:13Z","products":[{"vendor":"phicomm","product":"k2_firmware"},{"vendor":"phicomm","product":"k2g_firmware"},{"vendor":"phicomm","product":"k2p_firmware"},{"vendor":"phicomm","product":"k3_firmware"},{"vendor":"phicomm","product":"k3c_firmware"}],"references":[{"url":"https://www.tenable.com/security/research/tra-2022-01","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-25218"},{"url":"https://github.com/advisories/GHSA-j9f3-j4r5-j83v"}],"sources":{"cve":[{"id":"CVE-2022-25218","description":"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).","status":"published","published":"2022-03-07T21:50:25Z","modified":"2024-08-03T04:36:06.287Z","updated_at":"2026-11-02T14:34:28.707644Z"}],"euvd":[{"id":"EUVD-2022-29917","description":"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).","status":"published","published":"2022-03-07T21:50:25Z","modified":"2024-08-03T04:36:06Z","updated_at":"2026-11-03T03:25:47.443246Z"}],"ghsa":[{"id":"GHSA-j9f3-j4r5-j83v","title":"The use of the RSA algorithm without OAEP, or any other padding scheme, in telnetd_startup,...","description":"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).","status":"published","published":"2022-03-11T00:02:11Z","modified":"2023-01-27T05:00:35Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T14:41:43.230329Z"}],"nvd":[{"id":"CVE-2022-25218","description":"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).","status":"published","published":"2022-03-10T17:47:02.133Z","modified":"2026-06-17T04:33:13.52Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:07:13.7085Z"}]}}