Debian update for libreswan

Published: 2020-05-14
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-1763
Exploitation vector Network
Public exploit N/A
Vulnerable software
libreswan (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-1763

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing IKEv1 informational exchange messages. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.


Update libreswan package to version 3.27-6+deb10u1.

Vulnerable software versions

libreswan (Debian package): 3.27, 3.27-1, 3.27-2, 3.27-3, 3.27-4, 3.27-5, 3.27-6, 3.28-1, 3.29, 3.29-1, 3.29-2, 3.29-2+b1

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.