CVE-2021-31684

Exp

A vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 and 2.4 which causes a denial of service (DOS) via a crafted web request.

Published: 2021-06-01 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-31684 is rated Exploit Available (54/100): CVSS High severity, with low exploitation likelihood (EPSS 0.11%). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2021-31684

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

Exploit prediction scoring system (EPSS) score for CVE-2021-31684

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 2025-11-21 1.54% 0.11% -1.43%
2 2025-11-18 0.06% 1.54% +1.49%
3 2025-03-17 — 0.06% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-31684

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: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: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: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.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 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:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-31684

GitHub Security Advisory for CVE-2021-31684

GHSA-fg2v-w576-w4v3 · Severity: high · Ecosystem: maven — Out of bounds read in json-smart

OS Trackers for CVE-2021-31684

vendor priority summary link
debian unimportant CVE-2021-31684 unimportant priority: Debian including 1 source packages (json-smart), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-31684
redhat medium — https://access.redhat.com/security/cve/CVE-2021-31684
ubuntu medium CVE-2021-31684 medium priority: Ubuntu including 1 source packages (json-smart), 11 status rows across 11 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): released 5, ignored 4, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2021-31684

Affected software / configurations for CVE-2021-31684

Vendor Product Version Raw CPE
json-smart_project json-smart-v1 >= 1.3, < 1.3.3 cpe:2.3:a:json-smart_project:json-smart-v1:*:*:*:*:*:*:*:*
json-smart_project json-smart-v2 >= 2.4, < 2.4.4 cpe:2.3:a:json-smart_project:json-smart-v2:*:*:*:*:*:*:*:*
oracle utilities_framework 4.4.0.0.0 cpe:2.3:a:oracle:utilities_framework:4.4.0.0.0:*:*:*:*:*:*:*
oracle utilities_framework 4.4.0.2.0 cpe:2.3:a:oracle:utilities_framework:4.4.0.2.0:*:*:*:*:*:*:*
oracle utilities_framework 4.4.0.3.0 cpe:2.3:a:oracle:utilities_framework:4.4.0.3.0:*:*:*:*:*:*:*

References for CVE-2021-31684

cvelogic Threat Intelligence