CVE-2021-42009 Apache Traffic Control Traffic Ops Email Injection Vulnerability

What is CVE-2021-42009?

CVE-2021-42009 is a medium-severity vulnerability in Apache Traffic Control, published on 12 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An authenticated Apache Traffic Control Traffic Ops user with Portal-level privileges can send a request with a specially-crafted email subject to the /deliveryservices/request Traffic Ops endpoint to send an email, from the Traffic Ops server, with an arbitrary body to an arbitrary email address. Apache Traffic Control 5.1.x users should upgrade to 5.1.3 or 6.0.0. 4.1.x users should upgrade to 5.1.3.

Weakness: CWE-20

Which versions are affected by CVE-2021-42009?

3 open source packages ship an affected version, including github.com/apache/trafficcontrol. It affects 1 product.

Products include Apache Traffic Control.

How do I fix CVE-2021-42009?

Upgrade github.com/apache/trafficcontrol to a fixed version for your release line: 5.1.3 or 5.1.3+incompatible.

Is CVE-2021-42009 being exploited?

There is no known exploitation of CVE-2021-42009 in the wild and no public exploit code.

Other vulnerabilities in Apache Traffic Control

• CVE-2024-45387 Apache Traffic Control: SQL Injection in Traffic Ops endpoint PUT deliveryservice_request_comments Critical 9.9
• CVE-2021-43350 LDAP filter injection vulnerability in Traffic Ops Critical 9.8
• CVE-2019-12405 Improper Authentication in Apache Traffic Control Critical 9.8
• CVE-2025-61581 Apache Traffic Control: ReDoS issue in Traffic Router configuration High 7.5
• CVE-2022-23206 Server-Side Request Forgery in Traffic Ops endpoint POST /user/login/oauth High 7.5

Sources

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

Also known as GHSA-gw97-f6h8-gm94, GO-2022-0602.