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CVE-2021-45701

31
FAUCET Score

CVE-2021-45701 is a critical use-after-free vulnerability affecting the tremor-script crate in Rust, specifically versions prior to 0.11.6, impacting products from the Linux Foundation. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low attack complexity, and high potential for confidentiality, integrity, and availability compromise. While there is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and it is not in the KEV catalog, the vulnerability has garnered significant community attention with 10 mentions, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.7.2, < 0.11.6CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:tremor-script:*:*:*:*:*: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
1.19%
Probability of exploitation in next 30 days
EPSS Percentile
64.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0119 is in the 51st percentile among its peer group of 36,862 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 (1)

rustpatch availablevia ghsa
Product: tremor-scriptFixed in: 0.11.6

Vendor Advisories (1)

rustGHSA-q2x5-6q7q-r872critical

Use After Free in tremor-script

Jan 6, 2022

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/tremor-script/RUSTSEC-2021-0111.md
MitigationThird Party Advisory
rustsec.org / advisories/RUSTSEC-2021-0111.html
PatchThird Party Advisory