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CVE-2021-4315

28
FAUCET Score

CVE-2021-4315 is a critical vulnerability affecting NYUCCL psiTurk versions up to 3.2.0, specifically within the psiturk/experiment.py file. It stems from improper neutralization of special elements in a template engine when the 'mode' argument is manipulated. This flaw allows for high impact to confidentiality, integrity, and availability. With a CVSS score of 8.8 (High), this vulnerability can be exploited remotely with low attack complexity and requires only low privileges, making it a significant risk. The public disclosure of the exploit increases its potential for misuse. While the exploit has been publicly disclosed, there is currently no evidence of active exploitation in the wild, nor are there known Metasploit, Nuclei, or ExploitDB modules. Community discussion and media coverage for this CVE are minimal, which is typical for most vulnerabilities.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.2.1CPE matchmatch criteria
cpe:2.3:a:psiturk:psiturk:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.1
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.90%
Probability of exploitation in next 30 days
EPSS Percentile
55.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0090 is in the 51st percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 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 (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: psiTurkFixed in: 3.2.1

Vendor Advisories (1)

pipGHSA-9mq4-9556-6qxqhigh

NYUCCL psiTurk IS vulnerable to Improper Neutralization of Special Elements

Jan 29, 2023

References

github.com / NYUCCL/psiTurk/commit/47787e15cecd66f2aa87687bf852ae0194a4335f
Patch
github.com / NYUCCL/psiTurk/pull/517
Issue Tracking
github.com / NYUCCL/psiTurk/releases/tag/v3.2.1
Release Notes
vuldb.com
Permissions Required
vuldb.com
Permissions Required