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CVE-2020-15254

31
FAUCET Score

CVE-2020-15254 is a critical vulnerability affecting crossbeam-channel versions prior to 0.4.4, a component of the Crossbeam concurrent programming tools. The flaw stems from an incorrect assumption in the bounded channel's destructor regarding Vec::from_iter's allocated capacity, leading to unsound memory deallocation. With a CVSS score of 9.8 (CRITICAL), this vulnerability allows for remote, low-complexity attacks with high impacts on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.4CPE matchmatch criteria
cpe:2.3:a:crossbeam_project:crossbeam:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.78%
Probability of exploitation in next 30 days
EPSS Percentile
84.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0278 is in the 76th percentile among its peer group of 36,897 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 (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: crossbeam-channelFixed in: 0.4.4

Vendor Advisories (3)

rustGHSA-v5m7-53cv-f3hxhigh

crossbeam-channel Undefined Behavior before v0.4.4

Aug 25, 2021
redhatCVE-2020-15254Important

Mozilla: Undefined behavior in bounded channel of crossbeam rust crate

Oct 20, 2020
microsoft2020-Oct/CVE-2020-15254Critical

Undefined Behavior in bounded Crossbeam channel

Oct 13, 2020

References

github.com / crossbeam-rs/crossbeam/issues/539
ExploitThird Party Advisory
github.com / crossbeam-rs/crossbeam/pull/533
ExploitPatchThird Party Advisory
github.com / crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv-f3hx
Third Party Advisory
github.com / RustSec/advisory-db/pull/425
PatchThird Party Advisory