CVE-2024-3652

IKEv1 default AH/ESP responder can cause libreswan to abort and restart

MEDIUM
6.5
CVSS Score
Published: April 11, 2024 at 01:32 AM UTC
Updated: June 17, 2026 at 07:44 AM UTC
2 products affected across 2 vendorsLibreswanLibreswan

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifying an esp= line. When the peer requests AES-GMAC, libreswan's default proposal handler causes an assertion failure and crashes and restarts. IKEv2 connections are not affected.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

3.22 ≤ v < 4.15
Affected range stops below 4.15, so it looks safe — our inference, not a vendor statement
3.22 ≤ v ≤ 4.143.22
Vendor states this is fixed in 5.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

Mailing List
Source: d42dc95b-23f1-4e06-9076-20753a0fb0df
http://www.openwall.com/lists/oss-security/2024/04/18/2
Vendor AdvisoryThird Party Advisory
Source: d42dc95b-23f1-4e06-9076-20753a0fb0df
https://libreswan.org/security/CVE-2024-3652

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-404

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