CVE-2021-42009

Name: CVE-2021-42009
Creator: NVD / NIST
Published: 2021-10-12T08:15:06.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 2.73%

Last modified Jun 17, 2026

CVE-2021-42009 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 2.73% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

2.73%

84.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Traffic Control	>= 4.1.0, < 5.1.3

References

http://www.openwall.com/lists/oss-security/2021/10/12/1Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r78d471d8a4fd268a4c5ae6c47327c09d9d4b4467c31da2c97422febb%40%3Cdev.trafficcontrol.apache.org%3E
https://lists.apache.org/thread.html/r7dfa9a89b39d06caeeeb7b5cdc41b3493a9b86cc6cfa059d3f349d87%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/re384fd0f44c6d230f31376153c6e8b59e4a669f927c1533d06d702af%40%3Cdev.trafficcontrol.apache.org%3EMailing List, Vendor Advisory
https://lists.apache.org/thread.html/rf0481b9e38ece1ece458d3ce7b2d671df819e3555597f31fc34f084e%40%3Ccommits.trafficcontrol.apache.org%3EMailing List, Patch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/10/12/1Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r78d471d8a4fd268a4c5ae6c47327c09d9d4b4467c31da2c97422febb%40%3Cdev.trafficcontrol.apache.org%3E
https://lists.apache.org/thread.html/r7dfa9a89b39d06caeeeb7b5cdc41b3493a9b86cc6cfa059d3f349d87%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/re384fd0f44c6d230f31376153c6e8b59e4a669f927c1533d06d702af%40%3Cdev.trafficcontrol.apache.org%3EMailing List, Vendor Advisory
https://lists.apache.org/thread.html/rf0481b9e38ece1ece458d3ce7b2d671df819e3555597f31fc34f084e%40%3Ccommits.trafficcontrol.apache.org%3EMailing List, Patch, Vendor Advisory

Timeline

Published: Oct 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42009?

How severe is CVE-2021-42009?

CVE-2021-42009 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 2.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42009?

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.

Are you affected by CVE-2021-42009?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST