Home / mailings [USN-9081-1] OpenConnect vulnerability
Posted on 13 November 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-9081-1
November 12, 2026
openconnect vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
OpenConnect could be made to crash or run programs if it received specially
crafted network traffic.
Software Description:
- openconnect: An SSL VPN client
Details:
It was discovered that OpenConnect incorrectly handled certain certificate
data, leading to a buffer overflow. A remote attacker could possibly use
this issue to cause OpenConnect to crash, resulting in a denial of service,
or possibly execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS
libopenconnect5 8.05-1ubuntu0.1~esm1
Available with Ubuntu Pro
openconnect 8.05-1ubuntu0.1~esm1
Available with Ubuntu Pro
Ubuntu 18.04 LTS
libopenconnect5 7.08-3ubuntu0.18.04.2+esm1
Available with Ubuntu Pro
openconnect 7.08-3ubuntu0.18.04.2+esm1
Available with Ubuntu Pro
Ubuntu 16.04 LTS
libopenconnect5 7.06-2ubuntu0.1~esm1
Available with Ubuntu Pro
openconnect 7.06-2ubuntu0.1~esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-9081-1
CVE-2020-12823
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