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Fencer Vulns
medium 5.4

CVE-2018-16890 json

libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read.

published 2019-02-06 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8678

cvss
5.4
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.4%
EPSS 5.4% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • haxx libcurl 7.64.0
  • curl Debian 14, Debian 13, Debian 12 7.64.0-1

debian advisories DEBIAN-CVE-2018-16890

  • curl Ubuntu 16.04 LTS 7.47.0-1ubuntu2.12
  • curl Ubuntu 18.04 LTS 7.58.0-2ubuntu3.6

ubuntu advisories UBUNTU-CVE-2018-16890

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl RHEL 8 7.61.1-11.el8
  • libcurl RHEL 8 7.61.1-11.el8
  • libcurl-minimal RHEL 8 7.61.1-11.el8

red hat advisories RHSA-2019:3701

  • curl SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +9 more 7.37.0-37.34.1
  • curl SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 7.60.0-4.3.1
  • curl SLE Module for Basesystem 15 7.60.0-3.17.1

suse advisories SUSE-SU-2019:0249-2SUSE-SU-2019:0339-1SUSE-SU-2019:0249-1SUSE-SU-2019:0248-1

  • curl openSUSE Tumbleweed 7.79.1-1.1
  • curl openSUSE Leap 15.0 7.60.0-lp150.2.18.1
  • curl-mini openSUSE Leap 15.0 7.60.0-lp150.2.18.1

opensuse advisories openSUSE-SU-2024:10582-1openSUSE-SU-2019:0174-1

  • curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 7.64.0-r0
  • curl Alpine 3.8, Alpine 3.7, Alpine 3.6 7.61.1-r2

alpine advisories ALPINE-CVE-2018-16890

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl Arch Linux 7.64.0-1
  • lib32-curl Arch Linux 7.64.0-1
  • lib32-libcurl-compat Arch Linux 7.64.0-1
  • lib32-libcurl-gnutls Arch Linux 7.64.0-1
  • libcurl-gnutls Arch Linux 7.64.0-1

arch linux advisories AVG-873AVG-874AVG-875AVG-876AVG-877

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16890 updated cvss 4.3

curl: NTLM type-2 heap out-of-bounds buffer read

  • Red Hat .NET Core 1.0 on Red Hat Enterprise Linux rh-dotnetcore10-curl Red Hat .NET Core 1.1 on Red Hat Enterprise Linux rh-dotnetcore11-curl Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21-curl, rh-dotnet21-libcurl Red Hat .NET Core 2.2 on Red Hat Enterprise Linux rh-dotnet22-curl, rh-dotnet22-libcurl
    affected: workaround, no fix planned “Turn off NTLM authentication.”
  • Red Hat JBoss Core Services jbcs-httpd24-curl jbcs-httpd24-curl
    affected: workaround, no fix available “Turn off NTLM authentication.”
  • Red Hat Software Collections httpd24-curl, httpd24-libcurl
    affected: workaround, no fix planned “Turn off NTLM authentication.”
  • Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2
    fixed: vendor fix “Turn off NTLM authentication.” RHSA-2019:1543
  • Red Hat Enterprise Linux BaseOS (v. 8) curl 7.61.1-11.el8, libcurl 7.61.1-11.el8, libcurl-minimal 7.61.1-11.el8
    fixed: vendor fix “Turn off NTLM authentication.” RHSA-2019:3701
  • Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat JBoss Web Server 5 curl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-19-099-04 updated cvss 7.5

Siemens SINEMA Remote Connect (Update A)

  • Siemens SINEMA Remote Connect Client All versions < V2.0 HF1
    affected: fixed in V2.0, mitigation support.industry.siemens.com
  • Siemens SINEMA Remote Connect Server All versions < V2.0
    affected: vendor fix, mitigation

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-21-068-10 updated cvss 7.5

Siemens SCALANCE and SIMATIC libcurl (Update B)

  • Siemens SINEMA Remote Connect Client <V2.0_HF1
    affected: fixed in V2.0, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

5.35% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.4 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • The curl Project curl

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.