Description
The Internet Key Exchange v1 main mode is vulnerable to offline dictionary or brute force attacks. Reusing a key pair across different versions and modes of IKE could lead to cross-protocol authentication bypasses. It is well known, that the aggressive mode of IKEv1 PSK is vulnerable to offline dictionary or brute force attacks. For the main mode, however, only an online attack against PSK authentication was thought to be feasible. This vulnerability could allow an attacker to recover a weak Pre-Shared Key or enable the impersonation of a victim host or network.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.9 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 3.1% · top 12% of all CVEs (4 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
- CWE-521 Weak Password Requirements
- CWE-323 Reusing a Nonce, Key Pair in Encryption
- CWE-521 (opens in a new tab)All about CWE-521 and its CVEs
Affected products
- affected 5.5.1
References (5)
- https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdf (opens in a new tab)x_transferred
- https://www.kb.cert.org/vuls/id/857035 (opens in a new tab)x_transferred
- https://web-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.html (opens in a new tab)x_transferred
- https://blogs.cisco.com/security/great-cipher-but-where-did-you-get-that-key (opens in a new tab)x_transferred
- https://my.f5.com/manage/s/article/K42378447 (opens in a new tab)x_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)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-5389)Record last updated .