Debian DSA-4855-1 : openssl - security update

medium Nessus Plugin ID 146599
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The remote Debian host is missing a security-related update.


Multiple vulnerabilities have been discovered in OpenSSL, a Secure Sockets Layer toolkit. An overflow bug in the x64_64 Montgomery squaring procedure, an integer overflow in CipherUpdate and a NULL pointer dereference flaw X509_issuer_and_serial_hash() were found, which could result in denial of service.

Additional details can be found in the upstream advisories and


Upgrade the openssl packages.

For the stable distribution (buster), these problems have been fixed in version 1.1.1d-0+deb10u5.

See Also

Plugin Details

Severity: Medium

ID: 146599

File Name: debian_DSA-4855.nasl

Version: 1.2

Type: local

Agent: unix

Published: 2/19/2021

Updated: 2/23/2021

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: Medium

Score: 6.1


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:openssl, cpe:/o:debian:debian_linux:10.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/17/2021

Vulnerability Publication Date: 12/6/2019

Reference Information

CVE: CVE-2019-1551, CVE-2021-23840, CVE-2021-23841

DSA: 4855