CVE search · CVE-2016-6581
CVE-2016-6581
high 7.5
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.
Details
- Status
- Modified
- Published
- Last changed
- Source
- cve@mitre.org
- Weakness
- CWE-399
Severity
| Version | Score | Vector | Source |
|---|---|---|---|
| CVSS 3.0 | high 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
nvd@nist.govPrimary |
| CVSS 2.0 | high 7.8 | AV:N/AC:L/Au:N/C:N/I:N/A:C |
nvd@nist.govPrimary |
Affected products
Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.
References
- http://www.securityfocus.com/bid/92315Third Party AdvisoryVDB Entry
- https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.htmlMitigationVendor Advisory
- http://www.securityfocus.com/bid/92315Third Party AdvisoryVDB Entry
- https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.htmlMitigationVendor Advisory