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Debian LTS Advisory DLA-2773-1                [email protected]
https://www.debian.org/lts/security/                    Thorsten Alteholz
September 30, 2021                            https://wiki.debian.org/LTS
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Package        : curl
Version        : 7.52.1-5+deb9u16
CVE ID         : CVE-2021-22946 CVE-2021-22947

Two issues have been found in curl, a command line tool and an easy-to-use 
client-side library for transferring data with URL syntax.

      Crafted answers from a server might force clients to not use TLS on
      connections though TLS was required and expected.

      When using STARTTLS to initiate a TLS connection, the server might
      send multiple answers before the TLS upgrade and such the client
      would handle them as being trusted. This could be used by a
      MITM-attacker to inject fake response data.

For Debian 9 stretch, these problems have been fixed in version

We recommend that you upgrade your curl packages.

For the detailed security status of curl 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: https://wiki.debian.org/LTS