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Published: 24 May 2017

A programming error exists in a way Randombit Botan cryptographic library version 2.0.1 implements x500 string comparisons which could lead to certificate verification issues and abuse. A specially crafted X509 certificate would need to be delivered to the client or server application in order to trigger this vulnerability.

From the Ubuntu Security Team

It was discovered that Botan did not properly manage x509 DN strings comparisons when provided with a specially crafted X509 certificate. An attacker could possibly use this issue to cause out of bound reads, resulting in information leakage, denial of service, or potentially incorrect certificate validation results.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
cosmic Not vulnerable
disco Does not exist

eoan Does not exist

focal Does not exist

impish Does not exist

groovy Does not exist

jammy Does not exist

xenial Needed

Released (1.10.5-1+deb7u1ubuntu0.14.04.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
precise Ignored
(end of life)
artful Not vulnerable
bionic Not vulnerable
hirsute Does not exist

Released (1.10.16-1)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H