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CVE-2020-35711

23
FAUCET Score

CVE-2020-35711 describes a vulnerability in the arc-swap Rust crate (versions prior to 0.4.8 and 1.x prior to 1.1.0) where using arc_swap::access::Map with the Constant test helper or a custom Access trait implementation can result in dangling references. This high-severity vulnerability (CVSS 7.5) is network-exploitable with low attack complexity, leading to high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.8CPE matchmatch criteria
cpe:2.3:a:arc-swap_project:arc-swap:*:*:*:*:*:*:*:*
>= 1.0.0, < 1.1.0CPE matchmatch criteria
cpe:2.3:a:arc-swap_project:arc-swap:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.60%
Probability of exploitation in next 30 days
EPSS Percentile
73.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0160 is in the 55th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: arc-swapFixed in: 0.4.8
rustpatch availablevia ghsa
Product: arc-swapFixed in: 1.1.0

Vendor Advisories (1)

rustGHSA-9pqx-g3jh-qpqqhigh

Dangling reference in `access::Map` with Constant

May 24, 2022

References

github.com / vorner/arc-swap/issues/45
ExploitPatchThird Party Advisory
rustsec.org / advisories/RUSTSEC-2020-0091.html
Third Party Advisory