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CVE-2020-36318

31
FAUCET Score

CVE-2020-36318 is a critical use-after-free or double-free vulnerability affecting the Rust standard library before version 1.49.0, specifically within the VecDeque::make_contiguous function. With a CVSS score of 9.8, this flaw allows for unauthenticated, low-complexity remote exploitation, potentially leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.48.0, < 1.49.0CPE matchmatch criteria
cpe:2.3:a:rust-lang: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
1.68%
Probability of exploitation in next 30 days
EPSS Percentile
74.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0168 is in the 62nd 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 (8)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 17941-16820Fixed in: 1.59.0-1
microsoftpatch availablevia msrc
Product: cm1 rust 1.59.0-1 on CBL Mariner 1.0Fixed in: 1.59.0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 1.59.0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 1.59.0-1
redhatpatch availablevia redhat_api
Product: Red Hat Developer ToolsFixed in: rust-toolset-1.49-0:1.49.0-1.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Developer ToolsFixed in: rust-toolset-1.49-rust-0:1.49.0-1.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: rust-toolset:rhel8-8040020210113215649.bd734dca
View patch

Vendor Advisories (3)

microsoft2023-Mar/CVE-2020-36318

CVE-2020-36318

Mar 14, 2023
microsoft2021-Apr/CVE-2020-36318Critical

In the standard library in Rust before 1.49.0 VecDeque::make_contiguous has a bug that pops the same element more than once under certain condition. This bug could result in a use-after-free or double free.

Apr 13, 2021
redhatCVE-2020-36318Moderate

rust: use-after-free or double free in VecDeque::make_contiguous

Dec 7, 2020

References

github.com / rust-lang/rust/issues/79808
ExploitIssue TrackingPatchThird Party Advisory
github.com / rust-lang/rust/pull/79814
PatchThird Party Advisory