CVE-2007-1718

What it is

CRLF injection vulnerability in the mail function in PHP 4.0.0 through 4.4.6 and 5.0.0 through 5.2.1 allows remote attackers to inject arbitrary e-mail headers and possibly conduct spam attacks via a control character immediately following folding of the (1) Subject or (2) To parameter, as demonstrated by a parameter containing a "\r\n\t\n" sequence, related to an increment bug in the SKIP_LONG_HEADER_SEP macro.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

6.9% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2007-03-28 00:19 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:38 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 6.9% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2007-03-28 00:19 UTC

Last modified

2026-06-16 22:38 UTC

Exploit probability

6.9% · EPSS, next 30 days

Record status

Modified

Affected

• PHP 4.0
• PHP 4.0.0
• PHP 4.0.1
• PHP 4.0.2
• PHP 4.0.3
• PHP 4.0.4
• PHP 4.0.5
• PHP 4.0.6

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Complete

Availability

None

Is it in your code?

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