CVE-2018-14618
curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 11.1%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
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.)
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 11.12% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-131, CWE-190
- Affected
- haxx/libcurl · canonical/ubuntu linux · debian/debian linux · redhat/enterprise linux
- Source
- secalert@redhat.com
EPSS 11.1% 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.securitytracker.com/id/1041605Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3558Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1880
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14618Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
- https://curl.haxx.se/docs/CVE-2018-14618.htmlVendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0014Third Party Advisory
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://usn.ubuntu.com/3765-1/Third Party Advisory
- https://usn.ubuntu.com/3765-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4286Third Party Advisory
- http://www.securitytracker.com/id/1041605Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3558Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1880
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14618Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
- https://curl.haxx.se/docs/CVE-2018-14618.htmlVendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0014Third Party Advisory
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://usn.ubuntu.com/3765-1/Third Party Advisory
- https://usn.ubuntu.com/3765-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4286Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.