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CVE-2020-35861

23
FAUCET Score

CVE-2020-35861 is a vulnerability in the bumpalo Rust crate prior to version 3.2.1, where a flaw in the realloc feature allows for the reading of uninitialized memory. This could potentially expose sensitive data, such as cryptographic keys. The vulnerability has a CVSS score of 7.5 (HIGH), indicating a high severity due to its network-based attack vector and low attack complexity, leading to a high impact on confidentiality. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0.0, < 3.2.1CPE matchmatch criteria
cpe:2.3:a:bumpalo_project:bumpalo:*:*:*:*:*:rust:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
1.49%
Probability of exploitation in next 30 days
EPSS Percentile
71.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0149 is in the 53rd percentile among its peer group of 51,551 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 (1)

rustpatch availablevia ghsa
Product: bumpaloFixed in: 3.2.1

Vendor Advisories (1)

rustGHSA-vqx7-pw4r-29rrhigh

Out of bounds read in bumpalo

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2020-0006.html
ExploitPatchThird Party Advisory