Resource exhaustion in Apache Traffic Server
CVE-2019-9515
Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
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: 0.873 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.874 · newest: 0.873 · change: -0.001
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)
- lists.apache.org/thread.html/bde52309316ae798186d783a5e29f4ad1527f61c9219a289d0… (mailing-list)
- lists.apache.org/thread.html/392108390cef48af647a2e47b7fd5380e050e35ae8d1aa2030… (mailing-list)
- lists.apache.org/thread.html/ad3d01e767199c1aed8033bb6b3f5bf98c011c7c536f07a5d3… (mailing-list)
- 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/K50233772 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20190823-0005/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9515?
- CVE-2019-9515 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-2019-9515?
- High severity. CVSS v3 base score is 7.5 out of 10.