CVE-2021-34550: torproject tor
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-34550DEBIAN-CVE-2021-34550
Published 29-06-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-34550 is a high (CVSS 7.5) vulnerability in torproject tor. EPSS estimates a 1.56% chance of exploitation in the next 30 days, higher than 74.9% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.56%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 6 · Related 4Timeline
- 29-06-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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 crash, via a crafted onion service descriptor
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.56%
Chance of exploitation in the next 30 days
Percentile
75%
Versus all other CVEs
30-day change
0.00 pp
From 1.56% on 19-09-2026
19-09-202619-10-2026
EPSS score1.56%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- tor< 0.4.5.9-1
Torproject1 product
- tor< 0.3.5.15 | ≥ 0.4.0.0, < 0.4.4.9 | ≥ 0.4.5.0, < 0.4.5.9 | ≥ 0.4.6.0, < 0.4.6.5
Ubuntu1 product
- tor< 0.3.2.10-1ubuntu0.2~esm2 | < 0.4.2.7-1ubuntu0.1~esm1
3 vendors · 3 products
