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Fencer Vulns
high 7.5

CVE-2018-14618 in the critical feed json

curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code.

published 2018-09-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-6525

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
11.1%
EPSS 11.1% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)

Patch / fix

  • haxx libcurl 7.61.1
  • curl Debian 14, Debian 13, Debian 12 7.62.0-1

debian advisories DEBIAN-CVE-2018-14618

  • curl Ubuntu 14.04 LTS 7.35.0-1ubuntu2.17
  • curl Ubuntu 16.04 LTS 7.47.0-1ubuntu2.9
  • curl Ubuntu 18.04 LTS 7.58.0-2ubuntu3.3

ubuntu advisories UBUNTU-CVE-2018-14618

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 7 7.29.0-51.el7_6.3
  • libcurl RHEL 7 7.29.0-51.el7_6.3
  • httpd24-curl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el6
  • httpd24-curl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el7
  • httpd24-httpd RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-7.el6
  • httpd24-httpd RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-7.el7
  • httpd24-mod_md RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-7.el7
  • httpd24-libcurl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el6

red hat advisories RHSA-2019:1880RHSA-2018:3558

  • curl SLE Module for Basesystem 15 7.60.0-3.9.1
  • curl SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 7.37.0-37.26.1
  • curl SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 7.37.0-70.33.1
  • curl-openssl1 SLES 11-SECURITY 7.37.0-70.33.1
  • curl Studio Onsite 1.3 7.19.7-1.20.53.16.1

suse advisories SUSE-SU-2018:2714-1SUSE-SU-2018:2715-1SUSE-SU-2018:2717-1SUSE-SU-2018:2629-1

  • curl openSUSE Tumbleweed 7.79.1-1.1

opensuse advisories openSUSE-SU-2024:10582-1

  • curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 7.61.1-r0

alpine advisories ALPINE-CVE-2018-14618

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

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-2018-14618 updated cvss 7.5

curl: NTLM password overflow via integer overflow

  • 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 2.0 on Red Hat Enterprise Linux rh-dotnet20-curl
    affected: no fix planned “Out of support scope”
  • Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21-curl, rh-dotnet21-libcurl Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl
    affected: no fix planned “Will not fix”
  • Red Hat Ansible Tower 3.4 for RHEL 7 Server ansible-tower-34/ansible-tower-memcached 1.4.15-28, ansible-tower-35/ansible-tower-memcached 1.4.15-28, ansible-tower-37/ansible-tower-memcached-rhel7 1.4.15-28
    fixed: vendor fix RHBA-2020:0547
  • Red Hat Enterprise Linux Client (v. 7) curl 7.29.0-51.el7_6.3, libcurl 7.29.0-51.el7_6.3 Red Hat Enterprise Linux Client Optional (v. 7) libcurl-devel 7.29.0-51.el7_6.3, curl-debuginfo 7.29.0-51.el7_6.3 Red Hat Enterprise Linux ComputeNode (v. 7) curl 7.29.0-51.el7_6.3, libcurl 7.29.0-51.el7_6.3 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libcurl-devel 7.29.0-51.el7_6.3, curl-debuginfo 7.29.0-51.el7_6.3 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) curl 7.29.0-51.el7_6.3, libcurl 7.29.0-51.el7_6.3 Red Hat Enterprise Linux Server (v. 7) curl 7.29.0-51.el7_6.3, libcurl 7.29.0-51.el7_6.3
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) curl 7.29.0-51.el7_6.3, libcurl 7.29.0-51.el7_6.3
    fixed: vendor fix RHSA-2019:1880
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-curl 7.61.1-1.el6, httpd24-httpd 2.4.34-7.el6, httpd24-nghttp2 1.7.1-7.el6, httpd24-libcurl 7.61.1-1.el6, httpd24-mod_ssl 2.4.34-7.el6, httpd24-mod_ldap 2.4.34-7.el6, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-curl 7.61.1-1.el6, httpd24-httpd 2.4.34-7.el6, httpd24-nghttp2 1.7.1-7.el6, httpd24-libcurl 7.61.1-1.el6, httpd24-mod_ssl 2.4.34-7.el6, httpd24-mod_ldap 2.4.34-7.el6, +5 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more
    fixed: vendor fix RHSA-2018:3558
  • Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal Red Hat JBoss Core Services jbcs-httpd24-curl jbcs-httpd24-curl Red Hat JBoss Web Server 3 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

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
total
Assessed
6 mo ago

Exploit prediction

11.12% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • [UNKNOWN] curl

Classification

Weakness
  • CWE-131 Incorrect Calculation of Buffer Size
  • CWE-122 Heap-based Buffer Overflow
  • CWE-190 Integer Overflow or Wraparound

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.