Torproject Tor
41 CVEs affecting Torproject Tor. Latest disclosed: 2026-05-07. Critical: 0, High: 22.
| CVE | Severity | Score | Published | Summary |
|---|---|---|---|---|
CVE-2022-33903 | High | 7.5 | 2022-07-17 | Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation. |
CVE-2021-38385 | High | 7.5 | 2021-08-30 | Tor before 0.3.5.16, 0.4.5.10, and 0.4.6.7 mishandles the relationship between batch-signature verification and single-signature verification, leading to a rem… |
CVE-2021-34550 | High | 7.5 | 2021-06-29 | An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-006. The v3 onion service descriptor parsing allows out-of-bounds memory access, and a client cra… |
CVE-2021-34549 | High | 7.5 | 2021-06-29 | An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can t… |
CVE-2021-34548 | High | 7.5 | 2021-06-29 | An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003. An attacker can forge RELAY_END or RELAY_RESOLVED to bypass the intended access control for… |
CVE-2021-28089 | High | 7.5 | 2021-03-19 | Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust CPU resources on a target, aka TROVE-2021-001. |
CVE-2020-15572 | High | 7.5 | 2020-07-15 | Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network… |
CVE-2020-10593 | High | 7.5 | 2020-03-23 | 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 (memory leak), aka TROVE-2020-004. T… |
CVE-2020-10592 | High | 7.5 | 2020-03-23 | 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-2020-00… |
CVE-2015-2929 | High | 7.5 | 2020-01-24 | The Hidden Service (HS) client implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote servers to cause a deni… |
CVE-2015-2928 | High | 7.5 | 2020-01-24 | The Hidden Service (HS) server implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote attackers to cause a de… |
CVE-2015-2689 | High | 7.5 | 2020-01-24 | Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote… |
CVE-2015-2688 | High | 7.5 | 2020-01-24 | buf_pullup in Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle unexpected arrival times of buffers with invalid layouts, which allows r… |
CVE-2019-8955 | High | 7.5 | 2019-02-21 | 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 relay… |
CVE-2016-9079 | High | 7.5 | 2018-06-11 | A use-after-free vulnerability in SVG Animation has been discovered. An exploit built on this vulnerability has been discovered in the wild targeting Firefox a… |
CVE-2018-0491 | High | 7.5 | 2018-03-05 | A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10. It allows remote attackers to cause a denial of service (relay crash) because the KIST im… |
CVE-2018-0490 | High | 7.5 | 2018-03-05 | 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. The directory-authority protocol-list subprotocol impleme… |
CVE-2016-1254 | High | 7.5 | 2017-12-05 | Tor before 0.2.8.12 might allow remote attackers to cause a denial of service (client crash) via a crafted hidden service descriptor. |
CVE-2017-0377 | High | 7.5 | 2017-07-02 | Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers t… |
CVE-2017-0376 | High | 7.5 | 2017-06-09 | 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 funct… |