Vulnerability Monitor

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CVE-2016-6580

A HTTP/2 implementation built using any version of the Python priority library prior to version 1.2.0 could be targeted by a malicious peer by having that peer assign priority information for every possible HTTP/2 stream ID. The priority tree would happily continue to store the priority information for each stream, and would therefore allocate unbounded amounts of memory. Attempting to actually use a tree like this would also cause extremely high CPU usage to maintain the tree.

Published

2017-01-10T15:59:00.377

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-399

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	python	python_priority_library	1.0.0	Yes
Application	python	python_priority_library	1.1.0	Yes
Application	python	python_priority_library	1.1.1	Yes

References

http://www.securityfocus.com/bid/92311 Third Party Advisory, VDB Entry ([email protected])
https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html Mitigation, Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/92311 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html Mitigation, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)