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CVE-2019-9516

HIGH
Published 2019-08-13T20:50:59
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Expert Analysis

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CVSS Score

V3.0
7.5
/10
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.022
probability
of exploitation in the wild

There is a 2.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.837
Higher than 83.7% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed MODERATE

GHSA-6gw7-c226-vg73

Advisory Details

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.

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2019-9516
WEB https://access.redhat.com/errata/RHSA-2019:2745
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5
WEB https://lists.fedoraproject.org/archives/list/[email protected]/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD
WEB https://seclists.org/bugtraq/2019/Aug/24
WEB https://seclists.org/bugtraq/2019/Aug/40
WEB https://security.netapp.com/advisory/ntap-20190823-0002
WEB https://security.netapp.com/advisory/ntap-20190823-0005
WEB https://support.f5.com/csp/article/K02591030
WEB https://support.f5.com/csp/article/K02591030?utm_source=f5support&amp%3Butm_medium=RSS
WEB https://support.f5.com/csp/article/K02591030?utm_source=f5support&utm_medium=RSS
WEB https://usn.ubuntu.com/4099-1
WEB https://www.debian.org/security/2019/dsa-4505
WEB https://www.synology.com/security/advisory/Synology_SA_19_33
WEB https://access.redhat.com/errata/RHSA-2019:2746
WEB https://access.redhat.com/errata/RHSA-2019:2775
WEB https://access.redhat.com/errata/RHSA-2019:2799
WEB https://access.redhat.com/errata/RHSA-2019:2925
WEB https://access.redhat.com/errata/RHSA-2019:2939
WEB https://access.redhat.com/errata/RHSA-2019:2946
WEB https://access.redhat.com/errata/RHSA-2019:2950
WEB https://access.redhat.com/errata/RHSA-2019:2955
WEB https://access.redhat.com/errata/RHSA-2019:2966
WEB https://access.redhat.com/errata/RHSA-2019:3932
WEB https://access.redhat.com/errata/RHSA-2019:3933
WEB https://access.redhat.com/errata/RHSA-2019:3935
WEB https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
WEB https://kb.cert.org/vuls/id/605641
WEB https://kc.mcafee.com/corporate/index?page=content&id=SB10296
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2
WEB https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD
WEB http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
WEB http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
WEB http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
WEB http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html
WEB http://seclists.org/fulldisclosure/2019/Aug/16

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: January 14, 2025

References

https://kb.cert.org/vuls/id/605641/
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
https://seclists.org/bugtraq/2019/Aug/24
https://usn.ubuntu.com/4099-1/
http://seclists.org/fulldisclosure/2019/Aug/16
https://www.synology.com/security/advisory/Synology_SA_19_33
https://support.f5.com/csp/article/K02591030
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/
https://seclists.org/bugtraq/2019/Aug/40
https://www.debian.org/security/2019/dsa-4505
https://security.netapp.com/advisory/ntap-20190823-0002/
https://security.netapp.com/advisory/ntap-20190823-0005/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
https://kc.mcafee.com/corporate/index?page=content&id=SB10296
https://access.redhat.com/errata/RHSA-2019:2745
https://access.redhat.com/errata/RHSA-2019:2746
https://access.redhat.com/errata/RHSA-2019:2775
https://access.redhat.com/errata/RHSA-2019:2799
https://access.redhat.com/errata/RHSA-2019:2925
https://access.redhat.com/errata/RHSA-2019:2939
https://access.redhat.com/errata/RHSA-2019:2946
https://access.redhat.com/errata/RHSA-2019:2950
https://access.redhat.com/errata/RHSA-2019:2955
https://access.redhat.com/errata/RHSA-2019:2966
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html
https://support.f5.com/csp/article/K02591030?utm_source=f5support&amp%3Butm_medium=RSS
https://access.redhat.com/errata/RHSA-2019:3933
https://access.redhat.com/errata/RHSA-2019:3935
https://access.redhat.com/errata/RHSA-2019:3932
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/

HackerOne Reports

Nginx version is disclosed in HTTP response None
hckit_02
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Uncontrolled Resource Consumption
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Published: 2019-08-13T20:50:59
Last Modified: 2024-08-04T21:54:44.285Z
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