CVE-2018-16890
HIGHCVSS 7.5/10EPSS 5.35%
Last modified
CVE-2018-16890 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 5.35% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Libcurl | >= 7.36.0, < 7.64.0 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 18.10 |
| Debian | Debian Linux | 9.0 |
| Netapp | Clustered Data Ontap | All versions |
| Siemens | Sinema Remote Connect Client | <= 2.0 |
| Oracle | Communications Operations Monitor | 3.4 |
| Oracle | Communications Operations Monitor | 4.0 |
| Oracle | Http Server | 12.2.1.3.0 |
| Oracle | Secure Global Desktop | 5.4 |
| Redhat | Enterprise Linux | 8.0 |
| F5 | Big-Ip Access Policy Manager | >= 13.1.0, <= 13.1.3 |
| F5 | Big-Ip Access Policy Manager | >= 14.0.0, <= 14.1.2 |
| F5 | Big-Ip Access Policy Manager | >= 15.0.0, <= 15.0.1 |
References
- http://www.securityfocus.com/bid/106947Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:3701Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16890Issue Tracking, Mitigation, Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdfThird Party Advisory
- https://curl.haxx.se/docs/CVE-2018-16890.htmlPatch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20190315-0001/Patch, Third Party Advisory
- https://usn.ubuntu.com/3882-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4386Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/106947Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:3701Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16890Issue Tracking, Mitigation, Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdfThird Party Advisory
- https://curl.haxx.se/docs/CVE-2018-16890.htmlPatch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20190315-0001/Patch, Third Party Advisory
- https://usn.ubuntu.com/3882-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4386Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2018-16890?
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.
How severe is CVE-2018-16890?
CVE-2018-16890 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 5.35% probability of exploitation in the next 30 days.
How do I fix CVE-2018-16890?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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