CVE-2018-0500

Exp

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).

Published: 2018-07-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-0500 is rated High Exploit Risk (91.7/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.43%, 93th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +5.22% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-0500

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-0500

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.21% 6.43% +5.22%
2 2025-11-21 6.17% 1.21% -4.96%
3 2025-11-18 — 6.17% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-0500

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2018-0500

OS Trackers for CVE-2018-0500

vendor priority summary link
alpine critical CVE-2018-0500: 1 source package rows (curl); 35 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 25. https://security.alpinelinux.org/vuln/CVE-2018-0500
debian not yet assigned CVE-2018-0500 not yet assigned priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-0500
gentoo normal CVE-2018-0500: 1 GLSA(s) (201807-04), 1 atom(s) (net-misc/curl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-0500
redhat medium — https://access.redhat.com/security/cve/CVE-2018-0500
suse high CVE-2018-0500 severity important: SUSE including 348 source package names (0.1.0:libcurl4-7.60.0-3.6.4, 0.1.75:libcurl4-7.60.0-3.6.4, …), 417 product×package rows across 89 product lines (Container caasp/v4/389-ds, Container caasp/v4/busybox, … (89 product lines)): Fixed 212, Known Affected 157, Known Not Affected 48. https://www.suse.com/security/cve/CVE-2018-0500/
ubuntu medium CVE-2018-0500 medium priority: Ubuntu including 1 source packages (curl), 5 status rows across 5 suites (artful, bionic, trusty, upstream, xenial): not-affected 2, released 2, needs-triage 1. https://ubuntu.com/security/CVE-2018-0500

Affected software / configurations for CVE-2018-0500

Vendor Product Version Raw CPE
haxx curl >= 7.54.1, <= 7.60.0 cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
canonical ubuntu_linux 17.10 cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

References for CVE-2018-0500

cvelogic Threat Intelligence