CVE-2020-1763

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-125

Affected software

Vendor	Product	Versions
the libreswan Project	libreswan	from versions 3.27 till 3.31

References

https://bugzilla.redhat.com/show_bug.cgi?id=1813329Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763Issue Tracking, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdfThird Party Advisory
https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8Patch, Third Party Advisory
https://libreswan.org/security/CVE-2020-1763/CVE-2020-1763.txtPatch, Vendor Advisory
https://security.gentoo.org/glsa/202007-21Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04Third Party Advisory, US Government Resource
https://www.debian.org/security/2020/dsa-4684Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1813329Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763Issue Tracking, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdfThird Party Advisory
https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8Patch, Third Party Advisory
https://libreswan.org/security/CVE-2020-1763/CVE-2020-1763.txtPatch, Vendor Advisory
https://security.gentoo.org/glsa/202007-21Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04Third Party Advisory, US Government Resource
https://www.debian.org/security/2020/dsa-4684Third Party Advisory

Timeline

Published: May 12, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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