CVE-2021-23345 Server-side Request Forgery (SSRF)

What is CVE-2021-23345?

CVE-2021-23345 is a medium-severity server-side request forgery vulnerability in github.com/thecodingmachine/gotenberg, published on 26 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

All versions of package github.com/thecodingmachine/gotenberg are vulnerable to Server-side Request Forgery (SSRF) via the /convert/html endpoint when the src attribute of an HTML element refers to an internal system file, such as <iframe src='file:///etc/passwd'>.

Weakness: CWE-918

Which versions are affected by CVE-2021-23345?

It affects 1 product.

Products include Thecodingmachine Gotenberg.

How do I fix CVE-2021-23345?

No fix has been published for CVE-2021-23345 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2021-23345 being exploited?

There is no known exploitation of CVE-2021-23345 in the wild and no public exploit code.

Other vulnerabilities in github.com/thecodingmachine/gotenberg

• CVE-2026-40281 Gotenberg vulnerable to argument injection via newlines in ExifTool metadata values Critical 10.0
• CVE-2026-42589 Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection Critical 9.8
• CVE-2020-13450 Path traversal in n/a Critical 9.8
• CVE-2020-13451 Code injection in n/a Critical 9.8
• CVE-2020-13452 Privilege escalation in n/a Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-r97h-mg64-mcjr.