High severity · published May 12, 2020
CVE-2020-1763
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…
7.5
CVSS
3.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.6% · higher than 89% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libreswan · Libreswan
3.27 through 3.31; 3.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1763
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-1763
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1813329
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763
Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
Patch
https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8
Patch
https://libreswan.org/security/CVE-2020-1763/CVE-2020-1763.txt
Third Party Advisory
https://security.gentoo.org/glsa/202007-21
More from Libreswan
7.5
CVE-2026-12413
IKEv2 Denial of Service via malformed fragmentation
7.5
CVE-2023-30570
pluto in Libreswan before 4.11 allows a denial of service (responder SPI mishandling and daemon crash) via unauthenticated IKEv1 Aggressive Mode packets
7.5
CVE-2023-2295
A vulnerability was found in the libreswan library
7.5
CVE-2022-23094
Libreswan 4.2 through 4.5 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted IKEv1 packet because pluto/ikev1.c wrongly…
7.5
CVE-2019-12312
In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart