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CVE

CVE-2019-9518

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The a

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.

HIGH · CVSS 7.5 EPSS 0.03578
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0

Affected Products & Versions

26
apple swiftnio>= 1.0.0 and <= 1.4.0
apache traffic server>= 6.0.0 and <= 6.2.3
apache traffic server>= 7.0.0 and <= 7.1.6
apache traffic server>= 8.0.0 and <= 8.0.3
debian linuxall versions
synology skynasall versions

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cret@cert.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Aug 2019 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Advisories

20
rhsaRHSA-2020:3197Important
rhsaRHSA-2020:3196Important
rhsaRHSA-2020:0922Important
rhsaRHSA-2020:1445Important
🔗

References & Sources

21
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/fulldisclosure/2019/Aug/16Mailing ListThird Party Advisory
https://kb.cert.org/vuls/id/605641/Third Party AdvisoryUS Government Resource
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