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CRITICAL severity

CVE-2021-28035 — Stack Dst

CRITICAL

CVE-2021-28035 is a critical-severity (CVSS 9.8) CWE-908 vulnerability in stack_dst_project stack dst. A fix is available — see the affected versions and patch details below.

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

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs69th percentile — riskier than 69% of all scored CVEsHighest risk
0.00%0.60%1.20%1.80%0.4%1.3%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-28035 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

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

Affected Products

1 product · 1 configurations
Application
stack dststack_dst_project
< 0.6.1
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every stack_dst_project stack dst deployment and check each version against the affected-products list above.

  2. Fix

    Apply the stack_dst_project stack dst security patch or hotfix for CVE-2021-28035 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

An issue was discovered in the stack_dst crate before 0.6.1 for Rust. Because of the push_inner behavior, a drop of uninitialized memory can occur upon a val.clone() panic.
O3 Security · Runtime Protection

Is CVE-2021-28035 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
CVE-2021-28035: Stack Dst (Critical 9.8)