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Fencer Intel
high 7.5

CVE-2020-15572 json

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…

published 6y ago modified 4mo ago also EUVD-2020-7559

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Patch / fix

  • torproject tor 0.3.5.11, 0.4.2.8, 0.4.3.6
  • tor Debian 14, Debian 13, Debian 12 0.4.3.6-1

debian advisories DEBIAN-CVE-2020-15572

  • tor openSUSE Tumbleweed 0.4.6.7-2.2
  • tor Package Hub 15 SP2, Package Hub 15 SP1, Package Hub 12 +2 more 0.4.4.6-bp152.2.3.1

opensuse advisories openSUSE-SU-2024:11469-1openSUSE-SU-2020:1970-1

Is CVE-2020-15572 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.