What is CVE-2021-38562?

CVE-2021-38562 is a high-severity vulnerability in Bestpractical Request Tracker, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2021-10-18.

How severe is CVE-2021-38562?

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

Vulnerability in Bestpractical Request Tracker

CVE-2021-38562

Best Practical Request Tracker (RT) 4.2 before 4.2.17, 4.4 before 4.4.5, and 5.0 before 5.0.2 allows sensitive information disclosure via a timing attack against lib/RT/REST2/Middleware/Auth.pm.

Published 2021-10-18 · last modified 2026-06-17.

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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.018 (78.8th percentile), scored 2026-10-24.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

docs.bestpractical.com/release-notes/rt/index.html (Vendor Advisory)
github.com/bestpractical/rt/commit/70749bb66cb13dd70bd53340c371038a5f3ca57c (Patch, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.debian.org/debian-lts-announce/2022/06/msg00019.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-38562?: CVE-2021-38562 is a high-severity vulnerability in Bestpractical Request Tracker, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2021-10-18.
How severe is CVE-2021-38562?: High severity. CVSS v3 base score is 7.5 out of 10.