Debian Security Advisory

DLA-2760-1 nettle -- LTS security update

Date Reported:
18 Sep 2021
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 985652, Bug 989631.
In Mitre's CVE dictionary: CVE-2021-3580, CVE-2021-20305.
More information:

Multiple vulnerabilities were discovered in nettle, a low level cryptographic library, which could result in denial of service (remote crash in RSA decryption via specially crafted ciphertext, crash on ECDSA signature verification) or incorrect verification of ECDSA signatures.

For Debian 9 stretch, these problems have been fixed in version 3.3-1+deb9u1.

We recommend that you upgrade your nettle packages.

For the detailed security status of nettle please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: