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Vulnerability details: VCID-gfpv-cw2e-nbd7
Vulnerability ID VCID-gfpv-cw2e-nbd7
Aliases CVE-2021-27577
Summary Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. 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-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
System Score Found at
epss 0.00344 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.00344 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.00344 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2021-27577
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-27577
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-27577
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-27577
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:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
CVE-2021-27577 https://nvd.nist.gov/vuln/detail/CVE-2021-27577
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-2021-27577
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-2021-27577
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 0.56541
EPSS Score 0.00344
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:17:17.540072+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2021-27577 37.0.0