Vulnerability Details : CVE-2019-9516

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.
Published 2019-08-13 21:15:13
Updated 2025-01-14 19:29:56
Source CERT/CC
View at NVD,   CVE.org
Vulnerability category: Denial of service

Products affected by CVE-2019-9516

Threat overview for CVE-2019-9516

Top countries where our scanners detected CVE-2019-9516
Top open port discovered on systems with this issue 80
IPs affected by CVE-2019-9516 1,661,407
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2019-9516!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2019-9516

EPSS FAQ
2.21%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 84 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-9516

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.8
 MEDIUM AV:N/AC:L/Au:S/C:N/I:N/A:C
8.0
6.9
 NIST
7.5
 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
 CERT/CC
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.8
3.6
 NIST

CWE ids for CVE-2019-9516

  • The product does not properly control the allocation and maintenance of a limited resource.
    Assigned by: cret@cert.org (Secondary)
  • The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-9516

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