CVE-2018-19935

ext/imap/php_imap.c in PHP 5.x and 7.x before 7.3.0 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty string in the message argument to the imap_mail function.

Published: 2018-12-07 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-19935 is rated Moderate Risk (62.9/100): CVSS High severity, with high exploitation likelihood (EPSS 7.07%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2018-19935

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 2026-06-27 6.88% 7.07% +0.19%
2 2026-06-15 22.78% 6.88% -15.90%
3 2026-06-07 — 22.78% —

Full EPSS history (49 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-19935

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-19935

OS Trackers for CVE-2018-19935

vendor priority summary link
redhat low — https://access.redhat.com/security/cve/CVE-2018-19935
suse low CVE-2018-19935 severity low: SUSE including 811 source package names (apache2-mod_php53, apache2-mod_php7, …), 1645 product×package rows across 48 product lines (SLES for SAP Applications 11 SP3, SUSE CaaS Platform 4.0, … (48 product lines)): Fixed 1180, Known Not Affected 465. https://www.suse.com/security/cve/CVE-2018-19935/
ubuntu medium CVE-2018-19935 medium priority: Ubuntu including 5 source packages (php-imap, php5, php7.0, php7.2, php7.3), 25 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): DNE 15, released 7, needs-triage 2, not-affected 1. https://ubuntu.com/security/CVE-2018-19935

Affected software / configurations for CVE-2018-19935

Vendor Product Version Raw CPE
php php >= 5.6.0, < 5.6.39 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.0.0, < 7.0.33 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.1.0, < 7.1.26 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php >= 7.2.0, < 7.2.14 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2018-19935

cvelogic Threat Intelligence