CVE-2018-5389
mediumpriority · track · 25EPSS 0.031 · 88 %ileEUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (14)
External citations — patches, advisories, analysis.
- https://blogs.cisco.com/security/great-cipher-but-where-did-you-get-that-keycnnvd
- https://web-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.htmlcnnvd
- https://www.kb.cert.org/vuls/id/857035cnnvd
- https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdfcnnvd
- https://blogs.cisco.com/security/great-cipher-but-where-did-you-get-that-keyenisa_euvd
- https://my.f5.com/manage/s/article/K42378447enisa_euvd
- https://web-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.htmlenisa_euvd
- https://www.kb.cert.org/vuls/id/857035enisa_euvd
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