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Vulnerability record · CVE-2021-45079 · published 31 January 2022

CVE-2021-45079: Strongswan null pointer dereference vulnerability

Strongswan · Strongswan

In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.

9.1 CVSS 3.1 Critical EPSS 2.8% · top 14.2% CWE-476 · NULL pointer dereference
9.1CVSS 3.1 base score, v2 5.8
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.strongswan.org/blog/2022/01/24/strongswan-vulnerability-%28cve-2021-45079%29.html
https://www.strongswan.org/blog/2022/01/24/strongswan-vulnerability-%28cve-2021-45079%29.html

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Source: NIST National Vulnerability Database (record CVE-2021-45079), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.