CVE-2019-12387

Exp

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 update: 2024-11-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-12387 is rated High Exploit Risk (69.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.82%). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.29% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2019-12387

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-12387

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-31 0.53% 1.82% +1.29%
2 2025-12-28 0.72% 0.53% -0.19%
3 2025-12-27 — 0.72% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-12387

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2019-12387

GitHub Security Advisory for CVE-2019-12387

OS Trackers for CVE-2019-12387

vendor priority summary link
alpine medium CVE-2019-12387: 1 source package rows (py3-twisted); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2019-12387
debian not yet assigned CVE-2019-12387 not yet assigned priority: Debian including 1 source packages (twisted), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-12387
redhat medium — https://access.redhat.com/security/cve/CVE-2019-12387
suse medium CVE-2019-12387 severity moderate: SUSE including 38 source package names (python-Twisted, python-Twisted-15.2.1-9.23.1, …), 45 product×package rows across 20 product lines (HPE Helion OpenStack 8, SUSE Enterprise Storage 4, … (20 product lines)): Fixed 43, Known Not Affected 2. https://www.suse.com/security/cve/CVE-2019-12387/
ubuntu low CVE-2019-12387 low priority: Ubuntu including 2 source packages (twisted, twisted-py3), 14 status rows across 7 suites (bionic, cosmic, disco, eoan, trusty, upstream, xenial): DNE 6, released 4, ignored 2, needs-triage 2. https://ubuntu.com/security/CVE-2019-12387

Affected software / configurations for CVE-2019-12387

Vendor Product Version Raw CPE
twisted twisted < 19.2.1 cpe:2.3:a:twisted:twisted:*:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 19.10 cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
oracle zfs_storage_appliance_kit 8.8 cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
oracle solaris 11 cpe:2.3:o:oracle:solaris:11:*:*:*:*:*:*:*

References for CVE-2019-12387

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00030.html Broken Link
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00042.html Broken Link
https://github.com/twisted/twisted/commit/6c61fc4503ae39ab8ecee52d10f10ee2c371d7e2 Patch Third Party Advisory
https://labs.twistedmatrix.com/2019/06/twisted-1921-released.html Exploit Release Notes Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2G5RPDQ4BNB336HL6WW5ZJ344MAWNN7N/
https://twistedmatrix.com/pipermail/twisted-python/2019-June/032352.html Exploit Release Notes Vendor Advisory
https://usn.ubuntu.com/4308-1/ Third Party Advisory
https://usn.ubuntu.com/4308-2/ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html Patch Third Party Advisory
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