CVE-2021-42539

HIGHNVD 8.08.0—

8.0

The affected product is vulnerable to a missing permission validation on system backup restore, which could lead to account take over and unapproved settings change.

CVSS v3: 8.0
EG Score: 8.0(medium)
EPSS: 38.7%
KEV: Not listed

Published

October 22, 2021

Last Modified

November 21, 2024

References (2)

ics-cert@hqhttps://us-cert.cisa.gov/ics/advisories/icsa-21-278-02
af854a3a-2127-422b-91ae-364da2661108https://us-cert.cisa.gov/ics/advisories/icsa-21-278-02

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-306Missing Authentication for Critical Function

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 08:35 UTCEG score recompute
2026-05-26 08:35 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-42539?

CVE-2021-42539 is a high vulnerability published on October 22, 2021. The affected product is vulnerable to a missing permission validation on system backup restore, which could lead to account take over and unapproved settings change.

When was CVE-2021-42539 disclosed?

CVE-2021-42539 was first published in the National Vulnerability Database on October 22, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-42539 actively exploited?

CVE-2021-42539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42539?

CVE-2021-42539 has a CVSS v3 base score of 8.0 (NVD).

How do I remediate CVE-2021-42539?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42539, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-42539

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-42539?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)