CVE-2021-42860

Exp

A stack buffer overflow exists in Mini-XML v3.2. When inputting an unformed XML string to the mxmlLoadString API, it will cause a stack-buffer-overflow in mxml_string_getc:2611. NOTE: it is unclear whether this input is allowed by the API specification

Published: 2022-05-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-42860 is rated High Exploit Risk (65.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.35%). 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-2021-42860

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

Exploit prediction scoring system (EPSS) score for CVE-2021-42860

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 2025-05-27 0.10% 0.35% +0.24%
2 2025-03-30 0.33% 0.10% -0.23%
3 2025-03-29 — 0.33% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-42860

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-2021-42860

OS Trackers for CVE-2021-42860

vendor priority summary link
ubuntu low CVE-2021-42860 low priority: Ubuntu including 1 source packages (mxml), 10 status rows across 10 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, upstream, xenial): not-affected 5, ignored 4, needs-triage 1. https://ubuntu.com/security/CVE-2021-42860

Affected software / configurations for CVE-2021-42860

Vendor Product Version Raw CPE
mini-xml_project mini-xml 3.2 cpe:2.3:a:mini-xml_project:mini-xml:3.2:*:*:*:*:*:*:*

References for CVE-2021-42860

URL Tags
https://github.com/michaelrsweet/mxml/issues/286 Exploit Issue Tracking Third Party Advisory
cvelogic Threat Intelligence