CVE-2018-16890
libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 5.35% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-190
- Affected
- haxx/libcurl · canonical/ubuntu linux · debian/debian linux · netapp/clustered data ontap · siemens/sinema remote connect client · oracle/communications operations monitor · oracle/http server · oracle/secure global desktop · redhat/enterprise linux · f5/big-ip access policy manager
- Source
- secalert@redhat.com
EPSS 5.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
- https://security.netapp.com/advisory/ntap-20190315-0001/Patch, Third Party Advisory
- https://support.f5.com/csp/article/K03314397?utm_source=f5support&%3Butm_medium=RSS
- 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://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
- https://security.netapp.com/advisory/ntap-20190315-0001/Patch, Third Party Advisory
- https://support.f5.com/csp/article/K03314397?utm_source=f5support&%3Butm_medium=RSS
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.