What is CVE-2021-35472?

CVE-2021-35472 is a high-severity vulnerability in Lemonldap-Ng Lemonldap\, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.8/10. Published 2021-07-30.

How severe is CVE-2021-35472?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Lemonldap-Ng Lemonldap\

CVE-2021-35472

An issue was discovered in LemonLDAP::NG before 2.0.12. Session cache corruption can lead to authorization bypass or spoofing. By running a loop that makes many authentication attempts, an attacker might alternately be authenticated as one of two different users.

Published 2021-07-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/2539 (Exploit, Patch, Third Party Advisory)
gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/tags (Patch, Third Party Advisory)
www.debian.org/security/2021/dsa-4943 (vendor-advisory, Third Party Advisory)
gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/commit/8d3b763b6af2b8a9c4ad2765fbfab… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-35472?: CVE-2021-35472 is a high-severity vulnerability in Lemonldap-Ng Lemonldap\, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.8/10. Published 2021-07-30.
How severe is CVE-2021-35472?: High severity. CVSS v3 base score is 8.8 out of 10.