What is CVE-2021-40143?

CVE-2021-40143 is a high-severity vulnerability in Sonatype Nexus Repository Manager, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.2/10. Published 2021-09-07.

How severe is CVE-2021-40143?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Sonatype Nexus Repository Manager

CVE-2021-40143

Sonatype Nexus Repository 3.x through 3.33.1-01 is vulnerable to an HTTP header injection. By sending a crafted HTTP request, a remote attacker may disclose sensitive information or request external resources from a vulnerable instance.

Published 2021-09-07 · last modified 2026-09-22.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.023 (82.8th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

issues.sonatype.org/secure/ReleaseNote.jspa (Not Applicable)
support.sonatype.com/hc/en-us/articles/4405941762579 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-40143?: CVE-2021-40143 is a high-severity vulnerability in Sonatype Nexus Repository Manager, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.2/10. Published 2021-09-07.
How severe is CVE-2021-40143?: High severity. CVSS v3 base score is 8.2 out of 10.