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Fencer Intel
high 7.5

CVE-2020-10593 json

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), a…

published 6y ago modified 4mo ago also EUVD-2020-3043

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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. This occurs in circpad_setup_machine_on_circ because a circuit-padding machine can be negotiated twice on the same circuit.

Patch / fix

  • torproject tor 0.3.5.10, 0.4.1.9
  • tor Debian 14, Debian 13, Debian 12 0.4.2.7-1

debian advisories DEBIAN-CVE-2020-10593

  • 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
  • tor Package Hub 15 SP1 0.3.5.10-bp151.3.3.1
  • tor openSUSE Leap 15.1 0.3.5.10-lp151.2.3.1

opensuse advisories openSUSE-SU-2024:11469-1openSUSE-SU-2020:1970-1openSUSE-SU-2020:0428-1openSUSE-SU-2020:0406-1

  • tor Alpine 3.10 0.3.5.10-r0
  • tor Alpine 3.11 0.4.4.9-r0
  • tor Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 0.4.2.7-r0

alpine advisories ALPINE-CVE-2020-10593

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-10593 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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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10593 updated cvss 7.5

tor: there's a memory leak allowing remote attackers to cause a DoS

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.34% chance of exploitation in the next 30 days, higher than 83% 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 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

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.