CVE-2021-34551
HIGHCVSS 8.1/10EPSS 2.80%
Last modified
CVE-2021-34551 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. PHPMailer before 6.5.0 on Windows allows remote code execution if lang_path is untrusted data and has a UNC pathname.. EPSS estimates a 2.80% chance of exploitation in the next 30 days.
Description
PHPMailer before 6.5.0 on Windows allows remote code execution if lang_path is untrusted data and has a UNC pathname.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Phpmailer Project | Phpmailer | < 6.5.0 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
References
- https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.mdIssue Tracking, Third Party Advisory
- https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.mdIssue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-34551?
PHPMailer before 6.5.0 on Windows allows remote code execution if lang_path is untrusted data and has a UNC pathname.
How severe is CVE-2021-34551?
CVE-2021-34551 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 2.80% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34551?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-34551?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST