HOMEVULNERABILITIESCVE-2020-1763
HIGH

CVE-2020-1763

CWE-125Published: May 12, 2020· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-1763 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

libreswan1 product(s)
libreswan
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (16)

→
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

Quick Facts

CVE IDCVE-2020-1763
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected1 vendor(s)
PublishedMay 12, 2020

Related CVEs (CWE-125)

CVE-2021-41556
10.0
CVE-2026-24826
10.0
CVE-2017-14451
10.0
CVE-2021-21777
10.0
CVE-2013-0767
10.0
CVE-2009-2523
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-1763 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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