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Vulnerability details: VCID-88zm-3r8x-uucc
Vulnerability ID VCID-88zm-3r8x-uucc
Aliases CVE-2021-32778
Summary envoyproxy/envoy: excessive CPU usage when handling a large number of HTTP/2 requests
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-400 Uncontrolled Resource Consumption
CWE-834 Excessive Iteration
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-32778.json
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
epss 0.0007 https://api.first.org/data/v1/epss?cve=CVE-2021-32778
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-32778
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-32778
archlinux High https://security.archlinux.org/AVG-2321
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-32778.json
https://api.first.org/data/v1/epss?cve=CVE-2021-32778
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc
https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history
1996946 https://bugzilla.redhat.com/show_bug.cgi?id=1996946
AVG-2321 https://security.archlinux.org/AVG-2321
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*
CVE-2021-32778 https://nvd.nist.gov/vuln/detail/CVE-2021-32778
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-32778.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32778
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32778
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.2206
EPSS Score 0.0007
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:14:13.622533+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-32778.json 37.0.0