How severe is CVE-2021-28855?

CVE-2021-28855 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-28855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28855?

CVE-2021-28855 affects Entropymine Deark. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28855?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-28855 published?

CVE-2021-28855 was published on 2021-04-14 and last updated on 2026-06-17.

CVE-2021-28855

CVE-2021-28855 is a medium-severity vulnerability in Entropymine Deark with a CVSS 3.x base score of 5.5. 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-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Entropymine Deark
Published: 2021-04-14
Last modified: 2026-06-17

Description

In Deark before 1.5.8, a specially crafted input file can cause a NULL pointer dereference in the dbuf_write function (src/deark-dbuf.c).

Frequently asked questions

What is CVE-2021-28855?: In Deark before 1.5.8, a specially crafted input file can cause a NULL pointer dereference in the dbuf_write function (src/deark-dbuf.c).
How severe is CVE-2021-28855?: CVE-2021-28855 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-28855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28855?: CVE-2021-28855 affects Entropymine Deark. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28855 published?: CVE-2021-28855 was published on 2021-04-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:entropymine:deark:*:*:*:*:*:*:*:*

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