CVE-2005-1807: The Data function in class.smtp.php in PHPMailer 1.7.2 and earlier allows remote attackers to cause a denial o

Q: How do I fix CVE-2005-1807?

phpmailer: upgrade to newer than 1.72. Exact commands for each OS are on this page.

Q: Is CVE-2005-1807 being exploited?

CVE-2005-1807 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2005-1807 affect?

CVE-2005-1807 affects phpmailer. Severity is medium (CVSS 5.0). The Data function in class.smtp.php in PHPMailer 1.7.2 and earlier allows remote attackers to cause a denial of service (infinite loop leading to memory and CPU consumption) via a long header field.

Q: How urgent is CVE-2005-1807?

Priority 45/100. EPSS top 8%: very likely to be exploited; Public exploit reference

This month

MEDIUM 5.0UPGRADE

CVE-2005-1807 is a medium-severity flaw (CVSS 5.0) affecting phpmailer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Data function in class.smtp.php in PHPMailer 1.7.2 and earlier allows remote attackers to cause a denial of service (infinite loop leading to memory and CPU consumption) via a long header field.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	4.5% (top 8%)
CISA exploited list	No
Published	2005-05-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: phpmailer

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2005-05-28 04:00 UTCPublished CVE record published
2026-06-16 22:13 UTCUpdated Record last modified

phpmailer phpmailer UPGRADE

Affected: <= 1.72

Fixed in: newer than 1.72

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy phpmailer || rpm -q phpmailer || phpmailer --version

2. UPGRADE to newer than 1.72 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade phpmailer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade phpmailer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: PHPMailer 1.7 - 'Data()' Remote Denial of Service

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2005-1807?

phpmailer: upgrade to newer than 1.72. Exact commands for each OS are on this page.

Is CVE-2005-1807 being exploited?

CVE-2005-1807 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2005-1807 affect?

CVE-2005-1807 affects phpmailer. Severity is medium (CVSS 5.0). The Data function in class.smtp.php in PHPMailer 1.7.2 and earlier allows remote attackers to cause a denial of service (infinite loop leading to memory and CPU consumption) via a long header field.

How urgent is CVE-2005-1807?

Priority 45/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-3603 HIGH 8.1 UPGRADE MITIGATE PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such co
CVE-2021-34551 HIGH 8.1 UPGRADE MITIGATE PHPMailer before 6.5.0 on Windows allows remote code execution if lang_path is untrusted data and has a UNC pa
CVE-2020-36326 CRITICAL 9.8 UPGRADE UPGRADE PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UN
CVE-2020-13625 HIGH 7.5 UPGRADE MITIGATE PHPMailer before 6.1.6 contains an output escaping bug when the name of a file attachment contains a double qu
CVE-2018-19296 HIGH 8.8 UPGRADE MITIGATE PHPMailer before 5.2.27 and 6.x before 6.0.6 is vulnerable to an object injection attack.

References

← Back to latest CVEs