How severe is CVE-2021-28034?

CVE-2021-28034 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-2021-28034 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28034?

CVE-2021-28034 affects Stack Dst Project Stack Dst. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28034?

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-2021-28034 published?

CVE-2021-28034 was published on 2021-03-05 and last updated on 2026-06-17.

CVE-2021-28034

CVE-2021-28034 is a critical-severity vulnerability in Stack Dst Project Stack Dst 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-415.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-415
Affected product: Stack Dst Project Stack Dst
Published: 2021-03-05
Last modified: 2026-06-17

Description

An issue was discovered in the stack_dst crate before 0.6.1 for Rust. Because of the push_inner behavior, a double free can occur upon a val.clone() panic.

Frequently asked questions

What is CVE-2021-28034?: An issue was discovered in the stack_dst crate before 0.6.1 for Rust. Because of the push_inner behavior, a double free can occur upon a val.clone() panic.
How severe is CVE-2021-28034?: CVE-2021-28034 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-2021-28034 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28034?: CVE-2021-28034 affects Stack Dst Project Stack Dst. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28034?: 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-2021-28034 published?: CVE-2021-28034 was published on 2021-03-05 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0033.html

Affected products (1)

cpe:2.3:a:stack_dst_project:stack_dst:*:*:*:*:*:rust:*:*

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