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Fencer Intel
critical 9.8

CVE-2018-0500 json

Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable b…

published 2018-07-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-1322

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.4%
EPSS 6.4% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

Patch / fix

  • curl Debian 14, Debian 13, Debian 12 7.61.0-1

debian advisories DEBIAN-CVE-2018-0500

  • curl Ubuntu 18.04 LTS 7.58.0-2ubuntu3.2

ubuntu advisories UBUNTU-CVE-2018-0500

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 SLE Module for Basesystem 15 7.60.0-3.6.4

suse advisories SUSE-SU-2018:2423-1

  • 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 7.61.0-r0

alpine advisories ALPINE-CVE-2018-0500

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 7.61.0-1
  • lib32-curl Arch Linux 7.61.0-1
  • lib32-libcurl-compat Arch Linux 7.61.0-1
  • lib32-libcurl-gnutls Arch Linux 7.61.0-1
  • libcurl-compat Arch Linux 7.61.0-1
  • libcurl-gnutls Arch Linux 7.61.0-1

arch linux advisories AVG-729AVG-730AVG-731AVG-732AVG-733AVG-734

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-2018-0500 updated cvss 7.5

curl: Heap-based buffer overflow in Curl_smtp_escape_eob() when uploading data over SMTP

  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2018:2486
  • 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 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
    +5 more products
    Red Hat Enterprise Linux 7 curl, libcurl 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 Red Hat Software Collections httpd24-curl, httpd24-libcurl
    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

Exploit prediction

6.35% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • curl.haxx.se https://curl.haxx.se/docs/adv_2018-70a2.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
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 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a curl before 7.61.0

Classification

Weakness

References

Sources

Fencer Intel 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.