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CVE-2021-28034

28
FAUCET Score

CVE-2021-28034 is a critical double-free vulnerability affecting the stack_dst crate for Rust, specifically versions prior to 0.6.1. This flaw, stemming from the push_inner behavior during a val.clone() panic, could lead to severe consequences including complete compromise of confidentiality, integrity, and availability. With a CVSS score of 9.8 (Critical), it is easily exploitable over the network without user interaction. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and community discussion is minimal, the high severity warrants immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6.1CPE matchmatch criteria
cpe:2.3:a:stack_dst_project:stack_dst:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.17%
Probability of exploitation in next 30 days
EPSS Percentile
64.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0117 is in the 50th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: stack_dstFixed in: 0.6.1

Vendor Advisories (1)

rustGHSA-8mjx-h23h-w2pgcritical

Double free in stack_dst

Sep 1, 2021

References

rustsec.org / advisories/RUSTSEC-2021-0033.html
PatchThird Party Advisory