What is CVE-2021-34550?

CVE-2021-34550 is a high-severity vulnerability in Torproject Tor, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2021-06-29.

How severe is CVE-2021-34550?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Torproject Tor

CVE-2021-34550

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

Vulnerability class: Buffer Overflow

EPSS: 0.016 (72.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Torproject Tor
N/a — versions n/a

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

cve@mitre.org (x_refsource_MISC, Broken Link)
cve@mitre.org (x_refsource_CONFIRM, Release Notes, Vendor Advisory)
cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)

Frequently asked questions

What is CVE-2021-34550?: CVE-2021-34550 is a high-severity vulnerability in Torproject Tor, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2021-06-29.
How severe is CVE-2021-34550?: High severity. CVSS v3 base score is 7.5 out of 10.