CVE & CISA-KEV Catalog

CVE-2019-9516

MEDIUMEPSS 99th pctl

6.5

CVSS v3

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.

CWE-400Resource Exhaustion CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

mod_http2Amazon

Fixed in:0:1.15.3-2.amzn2

Fixed in:0:1.15.3-2.amzn2

Fixed in:0:1.15.3-2.amzn2

mod_http2-debuginfoAmazon

Fixed in:0:1.15.3-2.amzn2

Fixed in:0:1.15.3-2.amzn2

Fixed in:0:1.15.3-2.amzn2

nginxDebian

Fixed in:1.14.2-3CVE-2019-9516

Fixed in:1.14.2-3CVE-2019-9516

Fixed in:1.14.2-3CVE-2019-9516

nginxUbuntu

Fixed in:1.10.3-0ubuntu0.16.04.4USN-4099-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.14.0-0ubuntu1.4USN-4099-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

nginx-commonUbuntu

Fixed in:1.10.3-0ubuntu0.16.04.4USN-4099-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.14.0-0ubuntu1.4USN-4099-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

nginx-coreUbuntu

Fixed in:1.10.3-0ubuntu0.16.04.4USN-4099-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.14.0-0ubuntu1.4USN-4099-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

nginx-extrasUbuntu

Fixed in:1.10.3-0ubuntu0.16.04.4USN-4099-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.14.0-0ubuntu1.4USN-4099-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

nginx-fullUbuntu

Fixed in:1.10.3-0ubuntu0.16.04.4USN-4099-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.14.0-0ubuntu1.4USN-4099-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

nginx-lightUbuntu

Fixed in:1.10.3-0ubuntu0.16.04.4USN-4099-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:1.14.0-0ubuntu1.4USN-4099-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Node.jsWindows application

Affected:12.0.0 12.8.1Fixed in:12.8.1Node.js Foundation

Affected:10.0.0 10.16.3Fixed in:10.16.3Node.js Foundation

Affected:8.0.0 8.16.1Fixed in:8.16.1Node.js Foundation

Node.js (LTS)Windows application

Affected:12.0.0 12.8.1Fixed in:12.8.1Node.js Foundation

Affected:8.0.0 8.16.1Fixed in:8.16.1Node.js Foundation

Affected:10.0.0 10.16.3Fixed in:10.16.3Node.js Foundation

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

56.26%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2023-21547	High	7.5	89%	-	Fix
CVE-2018-1000115	High	7.5	88%	-	Fix

Common questions

How do I fix CVE-2019-9516?

Published advisories record a fix for 11 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2019-9516 being actively exploited?

Not that we know of. CVE-2019-9516 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 56.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2019-9516?

CVE-2019-9516 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2019-9516 affect?

Published advisories record a fix for mod_http2 (Amazon), mod_http2-debuginfo (Amazon), nginx (Debian), nginx (Ubuntu), and 7 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.