What is CVE-2019-12387?

CVE-2019-12387 is a medium-severity vulnerability in Oracle Solaris, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2019-06-10.

How severe is CVE-2019-12387?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Oracle Solaris

CVE-2019-12387

In Twisted before 19.2.1, twisted.web did not validate or sanitize URIs or HTTP methods, allowing an attacker to inject invalid characters such as CRLF.

Published 2019-06-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.025 (84.6th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Oracle Solaris — versions 11
Oracle Zfs Storage Appliance Kit — versions 8.8
Twisted
Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Fedoraproject Fedora — versions 29

Weakness classification (CWE)

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

References

labs.twistedmatrix.com/2019/06/twisted-1921-released.html (Exploit, Release Notes, Vendor Advisory)
github.com/twisted/twisted/commit/6c61fc4503ae39ab8ecee52d10f10ee2c371d7e2 (Patch, Third Party Advisory)
twistedmatrix.com/pipermail/twisted-python/2019-June/032352.html (Exploit, Release Notes, Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2019-07/msg00030.html (vendor-advisory, Broken Link)
lists.opensuse.org/opensuse-security-announce/2019-07/msg00042.html (vendor-advisory, Broken Link)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
usn.ubuntu.com/4308-2/ (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/4308-1/ (vendor-advisory, Third Party Advisory)
www.oracle.com/security-alerts/cpuapr2020.html (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-12387?: CVE-2019-12387 is a medium-severity vulnerability in Oracle Solaris, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2019-06-10.
How severe is CVE-2019-12387?: Medium severity. CVSS v3 base score is 6.1 out of 10.