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Vulnerability details: VCID-1x8w-cfex-6fdb
Vulnerability ID VCID-1x8w-cfex-6fdb
Aliases CVE-2020-17509
Summary ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.
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 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
epss 0.01594 https://api.first.org/data/v1/epss?cve=CVE-2020-17509
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-17509
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-17509
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-17509
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17508
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17509
https://lists.apache.org/thread.html/raa9f0589c26c4d146646425e51e2a33e1457492df9f7ea2019daa6d3%40%3Cannounce.trafficserver.apache.org%3E
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:*:*:*:*:*:*:*:*
CVE-2020-17509 https://nvd.nist.gov/vuln/detail/CVE-2020-17509
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-17509
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-2020-17509
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 0.80889
EPSS Score 0.01594
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:14:20.765574+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2020-17509 37.0.0