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No exploitation reportedFix available

CVE-2019-9518

No exploitation reported by the sources we read.

  • Published2019-08-13
  • Fixed in12.8.1 · 10.16.3 · 8.16.1
  • WeaknessCWE-400 · CWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2019-08-1321:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-9518?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-9518?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Node.js
BranchAffectedFixed in
12.x≥ 12.0.0, < 12.8.112.8.1
10.x≥ 10.13.0, < 10.16.310.16.3
8.x≥ 8.9.0, < 8.16.18.16.1
8.x≥ 8.0.0, ≤ 8.8.1no fix published
10.x≥ 10.0.0, ≤ 10.12.0no fix published
Apache traffic server
BranchAffectedFixed in
6.x≥ 6.0.0, ≤ 6.2.3no fix published
7.x≥ 7.0.0, ≤ 7.1.6no fix published
8.0≥ 8.0.0, ≤ 8.0.3no fix published
Canonical ubuntu linux
BranchAffectedFixed in
16.4= 16.04no fix published
18.4= 18.04no fix published
19.4= 19.04no fix published

15 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Node.js to 12.8.1 · 10.16.3 · 8.16.1

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 3.07.5read 2026-10-23
  • NVDCVSS 2.07.8read 2026-10-23
  • CNAweakness (CWE)CWE-400read 2026-10-23
  • NVDweakness (CWE)CWE-770read 2026-10-23
  • FIRST EPSSEPSS score25.4 %read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2019-08-13
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is 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.

Is CVE-2019-9518 actively exploited?

Active exploitation of CVE-2019-9518 has not been confirmed. Its EPSS score was 25.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-9518?

CVE-2019-9518 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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