How severe is CVE-2021-47831?

CVE-2021-47831 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-2021-47831 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47831?

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.

Does CVE-2021-47831 have an EU (EUVD) identifier?

Yes. CVE-2021-47831 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2893.

When was CVE-2021-47831 published?

CVE-2021-47831 was published on 2026-01-16 and last updated on 2026-06-17.

CVE-2021-47831

CVE-2021-47831 is a high-severity vulnerability 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-1284.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 4.6
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2893
Weakness: CWE-1284
Published: 2026-01-16
Last modified: 2026-06-17

Description

Sandboxie 5.49.7 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the container folder input field. Attackers can paste a large buffer of repeated characters into the Sandbox container folder setting to trigger an application crash.

Frequently asked questions

What is CVE-2021-47831?: Sandboxie 5.49.7 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the container folder input field. Attackers can paste a large buffer of repeated characters into the Sandbox container folder setting to trigger an application crash.
How severe is CVE-2021-47831?: CVE-2021-47831 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-2021-47831 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47831?: 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.
Does CVE-2021-47831 have an EU (EUVD) identifier?: Yes. CVE-2021-47831 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2893.
When was CVE-2021-47831 published?: CVE-2021-47831 was published on 2026-01-16 and last updated on 2026-06-17.

References

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