How severe is CVE-2021-28027?

CVE-2021-28027 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28027 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28027?

CVE-2021-28027 affects Bam Project Bam. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28027?

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

When was CVE-2021-28027 published?

CVE-2021-28027 was published on 2021-03-05 and last updated on 2026-06-17.

CVE-2021-28027

CVE-2021-28027 is a critical-severity vulnerability in Bam Project Bam with a CVSS 3.x base score of 9.8. 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-191.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Bam Project Bam
Published: 2021-03-05
Last modified: 2026-06-17

Description

An issue was discovered in the bam crate before 0.1.3 for Rust. There is an integer underflow and out-of-bounds write during the loading of a bgzip block.

Frequently asked questions

What is CVE-2021-28027?: An issue was discovered in the bam crate before 0.1.3 for Rust. There is an integer underflow and out-of-bounds write during the loading of a bgzip block.
How severe is CVE-2021-28027?: CVE-2021-28027 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28027 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28027?: CVE-2021-28027 affects Bam Project Bam. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28027?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-28027 published?: CVE-2021-28027 was published on 2021-03-05 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0027.html

Affected products (1)

cpe:2.3:a:bam_project:bam:*:*:*:*:*:rust:*:*

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