How severe is CVE-2021-47824?

CVE-2021-47824 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-2021-47824 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47824?

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-2021-47824 have an EU (EUVD) identifier?

Yes. CVE-2021-47824 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2884.

When was CVE-2021-47824 published?

CVE-2021-47824 was published on 2026-01-16 and last updated on 2026-06-17.

CVE-2021-47824

CVE-2021-47824 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% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2884
Weakness: CWE-1284
Published: 2026-01-16
Last modified: 2026-06-17

Description

iDailyDiary 4.30 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the preferences tab name field. Attackers can paste a 2,000,000 character buffer into the default diary tab name to trigger an application crash.

Frequently asked questions

What is CVE-2021-47824?: iDailyDiary 4.30 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the preferences tab name field. Attackers can paste a 2,000,000 character buffer into the default diary tab name to trigger an application crash.
How severe is CVE-2021-47824?: CVE-2021-47824 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-2021-47824 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47824?: 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-2021-47824 have an EU (EUVD) identifier?: Yes. CVE-2021-47824 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2884.
When was CVE-2021-47824 published?: CVE-2021-47824 was published on 2026-01-16 and last updated on 2026-06-17.

References

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