A tor security update has been released for Debian GNU/Linux 10 to address multiple security vulnerabilities.

DSA 4932-1: tor security update

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Debian Security Advisory DSA-4932-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 18, 2021   https://www.debian.org/security/faq
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Package : tor
CVE ID : CVE-2021-34548 CVE-2021-34549 CVE-2021-34550
Debian Bug : 990000

Multiple security vulnerabilities were discovered in Tor, a
connection-based low-latency anonymous communication system, which
could result in denial of service or spoofing.

For the stable distribution (buster), these problems have been fixed in
version 0.3.5.15-1.

We recommend that you upgrade your tor packages.

For the detailed security status of tor please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/tor

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/