What’s Vulnerable › Vulnerabilities

CVE-2019-12387

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-06-10 · updated 2026-06-17
• Weakness: CWE-74

Description

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.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 19.10
• Fedoraproject Fedora: 29
• Oracle Corporation Solaris Operating System: 11
• Oracle Corporation Oracle ZFS Storage Appliance Kit: 8.8
• twisted: before 19.2.1 — fixed in 19.2.1

How to fix

Upgrade to a fixed version: twisted 19.2.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00030.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00042.html
• https://github.com/twisted/twisted/commit/6c61fc4503ae39ab8ecee52d10f10ee2c371d7e2
• https://labs.twistedmatrix.com/2019/06/twisted-1921-released.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2G5RPDQ4BNB336HL6WW5ZJ344MAWNN7N/
• https://twistedmatrix.com/pipermail/twisted-python/2019-June/032352.html
• https://usn.ubuntu.com/4308-1/
• https://usn.ubuntu.com/4308-2/
• https://www.oracle.com/security-alerts/cpuapr2020.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00030.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00042.html
• https://github.com/twisted/twisted/commit/6c61fc4503ae39ab8ecee52d10f10ee2c371d7e2

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