What is CVE-2013-4100?

CVE-2013-4100 is a high-severity vulnerability in Cryptocat Project, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2019-11-04.

How severe is CVE-2013-4100?

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

Improper input validation in Cryptocat Project

CVE-2013-4100

Cryptocat before 2.0.22 has Remote Denial of Service via username

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-11-04 · last modified 2026-06-16.

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.

EPSS exploit prediction

EPSS: 0.024 (83.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Cryptocat Project

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.openwall.com/lists/oss-security/2013/07/10/15 (Mailing List, Third Party Advisory)
tobtu.com/decryptocat.php (Product)
vuldb.com/ (Permissions Required)
www.securityfocus.com/bid/61094 (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2013-4100?: CVE-2013-4100 is a high-severity vulnerability in Cryptocat Project, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2019-11-04.
How severe is CVE-2013-4100?: High severity. CVSS v3 base score is 7.5 out of 10.