How severe is CVE-2021-42859?

CVE-2021-42859 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-42859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42859?

CVE-2021-42859 affects Mini-xml Project Mini-xml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42859?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-42859 published?

CVE-2021-42859 was published on 2022-05-26 and last updated on 2026-06-17.

CVE-2021-42859

CVE-2021-42859 is a high-severity vulnerability in Mini-xml Project Mini-xml with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-772.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-772
Affected product: Mini-xml Project Mini-xml
Published: 2022-05-26
Last modified: 2026-06-17

Description

A memory leak issue was discovered in Mini-XML v3.2 that could cause a denial of service. NOTE: testing reports are inconsistent, with some testers seeing the issue in both the 3.2 release and in the October 2021 development code, but others not seeing the issue in the 3.2 release

Frequently asked questions

What is CVE-2021-42859?: A memory leak issue was discovered in Mini-XML v3.2 that could cause a denial of service. NOTE: testing reports are inconsistent, with some testers seeing the issue in both the 3.2 release and in the October 2021 development code, but others not seeing the issue in the 3.2 release
How severe is CVE-2021-42859?: CVE-2021-42859 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-42859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42859?: CVE-2021-42859 affects Mini-xml Project Mini-xml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-42859 published?: CVE-2021-42859 was published on 2022-05-26 and last updated on 2026-06-17.

References

https://github.com/michaelrsweet/mxml/issues/286

Affected products (1)

cpe:2.3:a:mini-xml_project:mini-xml:3.2:*:*:*:*:*:*:*

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Other CWE-772 vulnerabilities

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CVE-2020-14339 — High (CVSS 8.8): A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process. This…
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