Tor vulnerabilitiesAnd the versions its exploited flaws hit.
Tor is made by Torproject. We track 35 published vulnerabilities listed under that exact name, across 445 versions. 1 of them is on the list of flaws known to be exploited, the newest added on 22 June 2023. Torproject lists newer releases under their own names, such as Tor Browser, so check those pages too.
The most recent Tor flaw added to the known-exploited list is CVE-2016-9079, on 22 June 2023. We keep watching the known-exploited list.
Is Tor listed under other names? Yes.
Torproject also lists Tor under more specific names, such as Tor Browser. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.
Which versions of Tor do the exploited flaws hit?
Each exploited flaw lists the versions it affects, as published by the vendor. Find your version, then patch.
Which Tor vulnerabilities are being exploited?
1 flaw is on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.5Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.
Which Tor flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- 88%
A use-after-free vulnerability in SVG Animation has been discovered.
- 15%CVE-2018-0491High
A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10.
- 4.6%CVE-2019-8955High
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
- 3.7%CVE-2017-16541Medium
Tor Browser before 7.0.9 on macOS and Linux allows remote attackers to bypass the intended anonymity feature and discover a client IP address via vectors involving a crafted web site that leverages file://...
- 3.2%CVE-2020-10592High
Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (CPU consumption), aka TROVE-2020-002.
- 3.1%CVE-2012-5573Medium
The connection_edge_process_relay_cell function in or/relay.c in Tor before 0.2.3.25 maintains circuits even if an unexpected SENDME cell arrives, which might allow remote attackers to cause a denial of service...
- 3.0%CVE-2016-1254High
Tor before 0.2.8.12 might allow remote attackers to cause a denial of service (client crash) via a crafted hidden service descriptor.
- 2.7%CVE-2021-34548High
An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003.
- 2.6%CVE-2018-0490High
An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10.
- 2.6%CVE-2017-0375High
The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the relay_send_end_cell_from_edge_ function via a malformed BEGIN cell.
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1 flaw being exploited affects software Acme tracks
Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.
- Matched to
- Tor on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 35 published vulnerabilities listed under the name Tor, across 445 versions. The most recent Tor flaw added to the known-exploited list is CVE-2016-9079, on 22 June 2023.
1 is on the list of flaws known to be exploited. The most recently added is CVE-2016-9079.
Torproject also lists Tor under more specific names, such as Tor Browser. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.
Create a Precursor Intelligence account and track Tor. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.