CVE-2016-6581 — Vulnetix

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CVE-2016-6581 PUBLISHED

A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.

EPSS 0.37% · 58.8th percentile

Risk Scores

EPSS Score

0.37%

58.8th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:16.04:LTS	python-hpack	0, 1.1.0-1, 2.0.1-1

Timeline

Jan 10, 2017 CVE Published
Feb 4, 2022 EPSS Score
Mar 28, 2022 EPSS Score
May 19, 2022 EPSS Score
Jul 10, 2022 EPSS Score
Sep 1, 2022 EPSS Score
Oct 23, 2022 EPSS Score
Dec 14, 2022 EPSS Score
Feb 4, 2023 EPSS Score
Mar 7, 2023 EPSS Score
Mar 28, 2023 EPSS Score
May 19, 2023 EPSS Score

References

https://ubuntu.com/security/CVE-2016-6581 third-party-advisory
https://github.com/python-hyper/hpack/pull/56 third-party-advisory
http://www.openwall.com/lists/oss-security/2016/08/04/3 third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2016-6581 third-party-advisory

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