CVE-2020-15572
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 Security Services (NSS), aka TROVE-2020-001.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 Security Services (NSS), aka TROVE-2020-001.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.40% probability · 72th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- torproject/tor
- Source
- cve@mitre.org
EPSS 1.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://blog.torproject.org/new-release-tor-03511-0428-0436-security-fixesRelease Notes, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/issues/33119Vendor Advisory
- https://trac.torproject.org/projects/tor/wiki/TROVEVendor Advisory
- https://blog.torproject.org/new-release-tor-03511-0428-0436-security-fixesRelease Notes, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/issues/33119Vendor Advisory
- https://trac.torproject.org/projects/tor/wiki/TROVEVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.