CVE-2020-8184

Exp

A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it is possible for an attacker to forge a secure or host-only cookie prefix.

Published: 2020-06-19 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8184 is rated High Exploit Risk (77/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.94%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.13% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-8184

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-8184

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.81% 2.94% +2.13%
2 2026-05-07 0.88% 0.81% -0.07%
3 2026-04-24 — 0.88% —

Full EPSS history (49 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8184

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-8184

GitHub Security Advisory for CVE-2020-8184

GHSA-j6w9-fv6q-3q52 · Severity: high · Ecosystem: rubygems — Rack allows Percent-encoded cookies to overwrite existing prefixed cookie names

OS Trackers for CVE-2020-8184

vendor priority summary link
debian not yet assigned CVE-2020-8184 not yet assigned priority: Debian including 1 source packages (ruby-rack), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-8184
redhat medium — https://access.redhat.com/security/cve/CVE-2020-8184
suse medium — https://www.suse.com/security/cve/CVE-2020-8184/
ubuntu medium CVE-2020-8184 medium priority: Ubuntu including 1 source packages (ruby-rack), 11 status rows across 11 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, trusty, upstream, xenial): released 6, ignored 3, not-affected 2. https://ubuntu.com/security/CVE-2020-8184

Affected software / configurations for CVE-2020-8184

Vendor Product Version Raw CPE
rack_project rack < 2.1.4 cpe:2.3:a:rack_project:rack:*:*:*:*:*:*:*:*
rack_project rack >= 2.2.0, < 2.2.3 cpe:2.3:a:rack_project:rack:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

References for CVE-2020-8184

URL Tags
https://groups.google.com/g/rubyonrails-security/c/OWtmozPH9Ak Mailing List Patch Third Party Advisory
https://hackerone.com/reports/895727 Exploit Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00006.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/01/msg00038.html Mailing List Third Party Advisory
https://usn.ubuntu.com/4561-1/ Third Party Advisory
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