CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5

What is CVE-2021-22958?

CVE-2021-22958 is a critical server-side request forgery vulnerability in Concretecms Concrete Cms, published on 7 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N

Weakness: CWE-918

Which versions are affected by CVE-2021-22958?

2 open source packages ship an affected version, including concrete5/concrete5. It affects 1 product.

Products include Concretecms Concrete Cms.

How do I fix CVE-2021-22958?

Upgrade concrete5/concrete5 to 8.5.5 or later.

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

Is CVE-2021-22958 being exploited?

There is no known exploitation of CVE-2021-22958 in the wild and no public exploit code.

Other vulnerabilities in Concretecms Concrete Cms

• CVE-2023-48648 Concrete CMS allows unauthorized access because directories can be created with insecure permissions Critical 9.8
• CVE-2022-21829 Code injection in concrete CMS Critical 9.8
• CVE-2021-40098 Path traversal in n/a Critical 9.8
• CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal Critical 9.4
• CVE-2022-30117 Path traversal in Concrete CMS Critical 9.1

All Concretecms Concrete Cms vulnerabilities

Sources

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

Also known as GHSA-284f-f2hw-j2gx.