CVE-2017-0376 Denial of service in Tor before 0.3.0.8

What is CVE-2017-0376?

CVE-2017-0376 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 9 Jun 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the connection_edge_process_relay_cell function via a BEGIN_DIR cell on a rendezvous circuit.

Weakness: CWE-617

Which versions are affected by CVE-2017-0376?

It affects 2 products.

Products include Debian Debian Linux, Torproject Tor.

How do I fix CVE-2017-0376?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-0376 being exploited?

There is no known exploitation of CVE-2017-0376 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-0376, DLA-982-1, DSA-3877-1, GHSA-4cxm-8xrj-7c53, MGASA-2017-0176, UBUNTU-CVE-2017-0376.