Apache Traffic Server up to 6.2.3/7.1.10/8.0.7 HTTP/2 Header memory corruption

Summaryinfo

A vulnerability categorized as problematic has been discovered in Apache Traffic Server up to 6.2.3/7.1.10/8.0.7. Affected by this vulnerability is an unknown functionality of the component HTTP2 Handler. Such manipulation as part of Header leads to memory corruption. This vulnerability is documented as CVE-2020-9494. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Apache Traffic Server up to 6.2.3/7.1.10/8.0.7. It has been rated as problematic. Affected by this issue is an unknown functionality of the component HTTP2 Handler. The manipulation as part of a Header leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. CVE summarizes:

Apache Traffic Server 6.0.0 to 6.2.3, 7.0.0 to 7.1.10, and 8.0.0 to 8.0.7 is vulnerable to certain types of HTTP/2 HEADERS frames that can cause the server to allocate a large amount of memory and spin the thread.

The weakness was released 06/24/2020 (Website). The advisory is shared for download at lists.apache.org. This vulnerability is handled as CVE-2020-9494 since 03/01/2020. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 05/11/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313985 (Unity Linux 20.1060e / 20.1070e Security Update: tomcat (UTSA-2026-017616)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (313985). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Apache

Name

• Traffic Server

Version

• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 7.1.9
• 7.1.10
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5
• 8.0.6
• 8.0.7

License

• open-source

Website

• Vendor: https://www.apache.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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