What’s Vulnerable › Vulnerabilities

CVE-2020-1763

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-12 · updated 2026-06-17
• Weakness: CWE-125

Description

An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker could use this flaw to crash libreswan by sending specially-crafted IKEv1 Informational Exchange packets. The daemon respawns after the crash.

Affected products

• The Libreswan Project libreswan: from 3.27 through 3.31; 3.5

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1813329
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763
• https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
• https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8
• https://libreswan.org/security/CVE-2020-1763/CVE-2020-1763.txt
• https://security.gentoo.org/glsa/202007-21
• https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04
• https://www.debian.org/security/2020/dsa-4684
• https://bugzilla.redhat.com/show_bug.cgi?id=1813329
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763
• https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
• https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8

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