No exploitation reported

CVE-2019-9516

No exploitation reported by the sources we read.

Published2019-08-13
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 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.

Timeline

dates in UTC

2019-08-1321:15CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2019-9516?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-9516?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Apache traffic server

Branch	Affected	Fixed in	Source
6.x	≥ 6.0.0, ≤ 6.2.3	no fix published	NVD
7.x	≥ 7.0.0, ≤ 7.1.6	no fix published	NVD
8.0	≥ 8.0.0, ≤ 8.0.3	no fix published	NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
16.4	= 16.04	no fix published	NVD
18.4	= 18.04	no fix published	NVD
19.4	= 19.04	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
30.x	= 30	no fix published	NVD
29.x	= 29	no fix published	NVD
32.x	= 32	no fix published	NVD

16 more products in the sources.

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

nginxAlmaLinux:8all versions · fixed in 1:1.14.1-9.module_el8.3.0+2165+af250afe.almaand 7 other packages
nginxAlmaLinux:8all versions · fixed in 1:1.14.1-9.module_el8.4.0+2221+af250afe.almaand 5 other packages
nginxAlmaLinux:8all versions · fixed in 1:1.14.1-9.module_el8.5.0+34+dc1cfba5.almaand 5 other packages
nodejs-nodemonAlmaLinux:8all versions · fixed in 1.18.3-1.module_el8.3.0+2023+d2377ea3
nodejs-nodemonAlmaLinux:8all versions · fixed in 1.18.3-1.module_el8.3.0+2047+b07ac28e
nodejs-packagingAlmaLinux:8all versions · fixed in 17-3.module_el8.3.0+2023+d2377ea3
nodejs-packagingAlmaLinux:8all versions · fixed in 17-3.module_el8.4.0+2224+b07ac28e
nodejs-packagingAlmaLinux:8all versions · fixed in 17-3.module_el8.4.0+2521+c668cc9f

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
CNACVSS 3.07.5read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
CNAweakness (CWE)CWE-400read 2026-10-23
NVDweakness (CWE)CWE-770read 2026-10-23
FIRST EPSSEPSS score56.3 %read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/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-2019-9516?

Is CVE-2019-9516 actively exploited?

Active exploitation of CVE-2019-9516 has not been confirmed. Its EPSS score was 56.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-9516?

CVE-2019-9516 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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