What is CVE-2018-6519?

CVE-2018-6519 is a high-severity vulnerability in Simplesamlphp Saml2, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.5/10. Published 2018-02-02.

How severe is CVE-2018-6519?

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

Vulnerability in Simplesamlphp Saml2

CVE-2018-6519

The SAML2 library before 1.10.4, 2.x before 2.3.5, and 3.x before 3.1.1 in SimpleSAMLphp has a Regular Expression Denial of Service vulnerability for fraction-of-seconds data in a timestamp.

Published 2018-02-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.2% 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: 0.017 · change: 0.000

Affected products

Simplesamlphp Saml2
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

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

References

simplesamlphp.org/security/201801-01 (Vendor Advisory)
www.debian.org/security/2018/dsa-4127 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6519?: CVE-2018-6519 is a high-severity vulnerability in Simplesamlphp Saml2, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.5/10. Published 2018-02-02.
How severe is CVE-2018-6519?: High severity. CVSS v3 base score is 7.5 out of 10.