CVE-2019-9511: Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service
Apache · Traffic Server
Vendor fix available · Affected: Apache Traffic Server · Exploitation: likely to be exploited (10% or more)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 99% of scored CVEs
DescriptionCVE.org
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Apache
- Published
- August 2019
- Bounty reports
- 1 disclosed on HackerOne
Disclosed bug bounty reports about CVE-2019-9511
The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.
- Integer Overflow Risk in HTTP/2 Proxy Window Size Calculationscurl · 2025 · medium severityN/A
CoverageNo articles yet
No CyberSIXT article names CVE-2019-9511 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-400cwe.mitre.org
- Vendor advisoryusn.ubuntu.com
- Vendor advisorylists.fedoraproject.org
- Vendor advisorylists.fedoraproject.org
- Vendor advisorydebian.org
- Vendor advisorylists.fedoraproject.org
- Vendor advisorylists.fedoraproject.org
- Vendor advisorylists.fedoraproject.org
- Vendor advisorydebian.org
- Vendor advisorylists.fedoraproject.org
- Vendor advisoryaccess.redhat.com
- Vendor advisorylists.opensuse.org
- Vendor advisorylists.opensuse.org
28 more references are in the CVE record.