CVE-2017-8031

An issue was discovered in Cloud Foundry Foundation cf-release (all versions prior to v279) and UAA (30.x versions prior to 30.6, 45.x versions prior to 45.4, 52.x versions prior to 52.1). In some cases, the UAA allows an authenticated user for a particular client to revoke client tokens for other users on the same client. This occurs only if the client is using opaque tokens or JWT tokens validated using the check_token endpoint. A malicious actor could cause denial of service.

Published: 2017-11-27 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-8031 is rated Moderate Risk (41.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.42%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2017-8031

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 2025-03-30 0.47% 0.42% -0.05%
2 2025-03-29 0.42% 0.47% +0.05%
3 2025-03-19 — 0.42% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-8031

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H 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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 3.6 [email protected]
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2017-8031

GitHub Security Advisory for CVE-2017-8031

GHSA-j4p3-2m2h-cv5f · Severity: medium · Ecosystem: maven — Cloud Foundry UAA Denial of Service through client token revocation endpoint

Affected software / configurations for CVE-2017-8031

Vendor Product Version Raw CPE
cloudfoundry cf-release <= 278 cpe:2.3:a:cloudfoundry:cf-release:*:*:*:*:*:*:*:*
cloudfoundry uaa-release >= 30, < 30.6 cpe:2.3:a:cloudfoundry:uaa-release:*:*:*:*:*:*:*:*
cloudfoundry uaa-release >= 45, < 45.4 cpe:2.3:a:cloudfoundry:uaa-release:*:*:*:*:*:*:*:*
cloudfoundry uaa-release 52 cpe:2.3:a:cloudfoundry:uaa-release:52:*:*:*:*:*:*:*

References for CVE-2017-8031

URL Tags
http://www.securityfocus.com/bid/101967 Third Party Advisory VDB Entry
https://www.cloudfoundry.org/cve-2017-8031/ Issue Tracking Third Party Advisory
cvelogic Threat Intelligence