Vulnerability Report

CVE-2018-5389

Title: Ietf Internet Key Exchange Auth Bypass

Other

Proof Of Concept

No public PoC currently indexed for CVE-2018-5389.

CWE Category CWE-521
Published Date Sep 06, 2018
Modified Date Jun 17, 2026
Exploit Status Not Found
Score 5.9 CVSS v3.0
Exploit Probability (EPSS)
3.04%

Vulnerability Summary

CVE-2018-5389: 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.

Impacted Vendors

I
internet_key_exchange 1
I
ietf 1

Reference Links

https://blogs.cisco.com/security/great-cipher-but-where-did-you-get-that-key https://my.f5.com/manage/s/article/K42378447 https://web-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.html https://www.kb.cert.org/vuls/id/857035 https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdf https://blogs.cisco.com/security/great-cipher-but-where-did-you-get-that-key https://my.f5.com/manage/s/article/K42378447 https://web-in-security.blogspot.com/2018/08/practical-dictionary-attack-on-ipsec-ike.html https://www.kb.cert.org/vuls/id/857035 https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-felsch.pdf
CVSS v3.0
Source Entity [email protected]
Severity MEDIUM
5.9
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.3
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:N/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2018-5389 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Stack

No specific products linked.