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CVE-2021-29935

23
FAUCET Score

CVE-2021-29935 is a use-after-free vulnerability affecting the uri::Formatter component in the Rocket web framework for Rust, specifically versions prior to 0.4.7. This flaw can be triggered if a user-provided function within the formatter panics, potentially leading to data corruption or denial of service. With a CVSS score of 7.3 (HIGH), it presents a moderate risk due to its network-based attack vector and low attack complexity, allowing for potential impact on confidentiality, integrity, and availability. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.7CPE matchmatch criteria
cpe:2.3:a:rocket:rocket:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.03%
Probability of exploitation in next 30 days
EPSS Percentile
60.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0103 is in the 37th percentile among its peer group of 51,485 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: rocketFixed in: 0.4.7

Vendor Advisories (1)

rustGHSA-vcw4-8ph6-7vw8high

Use after free in Rocket

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2021-0044.html
ExploitVendor Advisory