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Vulnerability details: VCID-xrq2-n48r-v3fv
Vulnerability ID VCID-xrq2-n48r-v3fv
Aliases CVE-2021-32566
Summary Improper Input Validation vulnerability in HTTP/2 of Apache Traffic Server allows an attacker to DOS the server. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-20 Improper Input Validation
System Score Found at
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
epss 0.03883 https://api.first.org/data/v1/epss?cve=CVE-2021-32566
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-32566
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-32566
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-32566
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27577
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32565
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32566
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32567
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35474
https://lists.apache.org/thread.html/ra1a41ff92a70d25bf576d7da2590575e8ff430393a3f4a0c34de4277%40%3Cusers.trafficserver.apache.org%3E
https://www.debian.org/security/2021/dsa-4957
990303 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990303
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
CVE-2021-32566 https://nvd.nist.gov/vuln/detail/CVE-2021-32566
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-32566
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-2021-32566
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 0.87806
EPSS Score 0.03883
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:17:19.625847+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2021-32566 37.0.0