Resource exhaustion in Apache Traffic Server
CVE-2019-9516
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.563 (99.0th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.563 · newest: 0.563 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.cert.org/vuls/id/605641/ (US Government Resource, Third Party Advisory, third-party-advisory)
- github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-0… (Third Party Advisory)
- seclists.org/bugtraq/2019/Aug/24 (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4099-1/ (vendor-advisory, Third Party Advisory)
- seclists.org/fulldisclosure/2019/Aug/16 (mailing-list, Mailing List, Third Party Advisory)
- www.synology.com/security/advisory/Synology_SA_19_33 (Third Party Advisory)
- support.f5.com/csp/article/K02591030 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- seclists.org/bugtraq/2019/Aug/40 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2019/dsa-4505 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9516?
- CVE-2019-9516 is a medium-severity vulnerability in Apache Traffic Server, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2019-08-13.
- How severe is CVE-2019-9516?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2019-9516 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.