Resource exhaustion in Apache Traffic Server
CVE-2019-9518
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.254 (98.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.254 · newest: 0.254 · change: 0.000
Affected products
Weakness classification (CWE)
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)
- 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/K46011592 (Third Party Advisory)
- lists.apache.org/thread.html/2653c56545573b528f3f6352a29eccaf498bd6fb2a6a59568d… (mailing-list)
- lists.apache.org/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fd… (mailing-list)
- lists.apache.org/thread.html/ff5b0821a6985159a832ff6d1a4bd311ac07ecc7db1e2d8bab… (mailing-list)
- security.netapp.com/advisory/ntap-20190823-0005/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9518?
- CVE-2019-9518 is a high-severity vulnerability in Apache Traffic Server, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2019-08-13.
- How severe is CVE-2019-9518?
- High severity. CVSS v3 base score is 7.5 out of 10.