What’s Vulnerable › Vulnerabilities

CVE-2019-12312

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-05-24 · updated 2026-06-17
• Weakness: CWE-476

Description

In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart. An attacker can trigger a NULL pointer dereference by initiating an IKEv2 IKE_SA_INIT exchange, followed by a bogus INFORMATIONAL exchange instead of the normallly expected IKE_AUTH exchange. This affects send_v2N_spi_response_from_state() in programs/pluto/ikev2_send.c that will then trigger a NULL pointer dereference leading to a restart of libreswan.

Affected products

• The Libreswan Project libreswan: before 3.28 — fixed in 3.28

How to fix

Upgrade to a fixed version: The Libreswan Project libreswan 3.28. Check the vendor advisory for mitigations.

References

• http://www.iwantacve.cn/index.php/archives/218/
• https://github.com/libreswan/libreswan/compare/9b1394e...3897683
• https://github.com/libreswan/libreswan/issues/246
• https://libreswan.org/security/CVE-2019-12312/CVE-2019-12312.txt
• https://libreswan.org/security/CVE-2019-12312/libreswan-3.27-CVE-2019-12312.patch
• http://www.iwantacve.cn/index.php/archives/218/
• https://github.com/libreswan/libreswan/compare/9b1394e...3897683
• https://github.com/libreswan/libreswan/issues/246
• https://libreswan.org/security/CVE-2019-12312/CVE-2019-12312.txt
• https://libreswan.org/security/CVE-2019-12312/libreswan-3.27-CVE-2019-12312.patch

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