CVE-2021-42009

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.82% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 85.3% of scored records. A rank, not a probability.

NVD base score

4.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-12 07:40Z4 YR AGO

Last updated

2024-08-04 03:22Z2 YR AGO

Reserved

2021-10-05

Assigning CNA

apache

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

2c989f691110136ecac7118ce5b3c34fa848f049cef029e0646c5fba76c17c24

• lists.apache.orghttps://lists.apache.org/thread.html/re384fd0f44c6d230f31376153c6e8b59e4a669f927c1533d06d702af%40%3Cdev.trafficcontrol.apache.org%3Ex_refsource_MISC
• lists.apache.orghttps://lists.apache.org/thread.html/rf0481b9e38ece1ece458d3ce7b2d671df819e3555597f31fc34f084e%40%3Ccommits.trafficcontrol.apache.org%3Ex_refsource_MISC
• www.openwall.com[oss-security] 20211012 CVE-2021-42009: Apache Traffic Control Arbitrary Email Content Insertion in /deliveryservices/requesthttp://www.openwall.com/lists/oss-security/2021/10/12/1mailing-listx_refsource_MLIST
• lists.apache.org[trafficcontrol-dev] 20211013 Re: CVE-2021-42009: Apache Traffic Control Arbitrary Email Content Insertion in /deliveryservices/requesthttps://lists.apache.org/thread.html/r78d471d8a4fd268a4c5ae6c47327c09d9d4b4467c31da2c97422febb%40%3Cdev.trafficcontrol.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[announce] 20211013 Re: CVE-2021-42009: Apache Traffic Control Arbitrary Email Content Insertion in /deliveryservices/requesthttps://lists.apache.org/thread.html/r7dfa9a89b39d06caeeeb7b5cdc41b3493a9b86cc6cfa059d3f349d87%40%3Cannounce.apache.org%3Emailing-listx_refsource_MLIST