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HIGH

CVE-2018-19518

CVSS v3

7.5

HIGH

EPSS Score

96.1 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-19518 Red Hat Product Security62 known affected

    php: imap_open() allows running arbitrary shell commands via mailbox parameter

    php.src as a component of Red Hat Enterprise Linux 5 · php53.src as a component of Red Hat Enterprise Linux 5 · php as a component of Red Hat Enterprise Linux 6

  • ICSA-26-239-02 CISA4 known affected

    All-Line Equipment Company Fuel-Boss

    All-Line Equipment Company Fuel-Boss V1 Standard: >=|<=PHP_7.1.5_7.1.5 · All-Line Equipment Company Fuel-Boss V1 Portal: >=|<=PHP_7.1.5_7.1.5 · All-Line Equipment Company Fuel-Boss V1 Master/Slave: >=|<=PHP_7.1.5_7.1.5

  • ICSA-26-027-02 CISA1 known affected

    Festo Didactic SE MES PC

    Festo Didactic SE MES PC shipped with Windows 10

Full record on NVD

Description

University of Washington IMAP Toolkit 2007f on UNIX, as used in imap_open() in PHP and other products, launches an rsh command (by means of the imap_rimap function in c-client/imap4r1.c and the tcp_aopen function in osdep/unix/tcp_unix.c) without preventing argument injection, which might allow remote attackers to execute arbitrary OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics. For example, if rsh is a link to ssh (as seen on Debian and Ubuntu systems), then the attack can use an IMAP server name containing a "-oProxyCommand" argument.

Technical details

Published
2018-11-25
Exploit-DB
EDB-45914

Frequently asked questions

What is CVE-2018-19518?

University of Washington IMAP Toolkit 2007f on UNIX, as used in imap_open() in PHP and other products, launches an rsh command (by means of the imap_rimap function in c-client/imap4r1.c and the tcp_aopen function in osdep/unix/tcp_unix.c) without preventing argument injection, which might allow remote attackers to execute arbitrary OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics. For example, if rsh is a link to ssh (as seen on Debian and Ubuntu systems), then the attack can use an IMAP server name containing a "-oProxyCommand" argument.

Is CVE-2018-19518 actively exploited?

Active exploitation of CVE-2018-19518 has not been confirmed. Its EPSS score was 96.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-19518?

CVE-2018-19518 has a CVSS v3 base score of 7.5 (HIGH severity).

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