Public proof of conceptFix available

CVE-2018-16890

A public proof of concept exists; no exploitation attested.

Published2019-02-06
WeaknessCWE-125 · CWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read. The function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly and is subject to an integer overflow vulnerability. Using that overflow, a malicious or broken NTLM server could trick libcurl to accept a bad length + offset combination that would lead to a buffer read out-of-bounds.

Timeline

dates in UTC

2019-02-0620:29CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-16890?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-16890?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
14.4	= 14.04	no fix published	NVD
16.4	= 16.04	no fix published	NVD
18.4	= 18.04	no fix published	NVD
18.10	= 18.10	no fix published	NVD

F5 big-ip access policy manager

Branch	Affected	Fixed in	Source
13.1	≥ 13.1.0, ≤ 13.1.3	no fix published	NVD
14.x	≥ 14.0.0, ≤ 14.1.2	no fix published	NVD
15.0	≥ 15.0.0, ≤ 15.0.1	no fix published	NVD

Oracle communications operations monitor

Branch	Affected	Fixed in	Source
3.4	= 3.4	no fix published	NVD
4.0	= 4.0	no fix published	NVD

7 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

bugzilla.redhat.comMitigation · Patch
curl.haxx.sePatch · Vendor Advisory
security.netapp.comPatch
www.oracle.comPatch
www.oracle.comPatch

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedmichelleamesquita/CVE-2018-16890

Sources

CISA-ADPSSVC decisionnone2026-04-15
OpenCVESSVC decisionnone—
NVDCVSS 3.17.5read 2026-10-23
CNACVSS 3.05.4read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-125read 2026-10-23
NVDweakness (CWE)CWE-125, CWE-190read 2026-10-23
FIRST EPSSEPSS score5.4 %2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2019-02-06
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-16890?

Is CVE-2018-16890 actively exploited?

Active exploitation of CVE-2018-16890 has not been confirmed. Its EPSS score was 5.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-16890?

CVE-2018-16890 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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