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Vulnerability details: VCID-gfwa-frtw-xbcv
Vulnerability ID VCID-gfwa-frtw-xbcv
Aliases CVE-2021-37147
Summary Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00519 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.00718 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.0109 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.0109 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.0109 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.0109 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.0109 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
epss 0.0109 https://api.first.org/data/v1/epss?cve=CVE-2021-37147
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-37147
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-37147
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-37147
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37147
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37148
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37149
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38161
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44040
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44759
https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164
https://www.debian.org/security/2022/dsa-5153
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:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
CVE-2021-37147 https://nvd.nist.gov/vuln/detail/CVE-2021-37147
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-37147
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:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-37147
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 0.65844
EPSS Score 0.00519
Published At Sept. 9, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T12:20:27.515982+00:00 EPSS Importer Import https://epss.cyentia.com/epss_scores-current.csv.gz 37.0.0