CVE-2021-4315: A vulnerability has been found in NYUCCL psiTurk up to 3.2.0 and classified as critical

Q: How do I fix CVE-2021-4315?

psiturk: upgrade to 3.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-4315 being exploited?

CVE-2021-4315 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4315 affect?

CVE-2021-4315 affects psiturk. Severity is medium (CVSS 5.5). A vulnerability has been found in NYUCCL psiTurk up to 3.2.0 and classified as critical. This vulnerability affects unknown code of the file psiturk/experiment.py. The manipulation of the argument mode leads to improper neutralization of sp

Q: How urgent is CVE-2021-4315?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2021-4315 is a medium-severity flaw (CVSS 5.5) affecting psiturk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in NYUCCL psiTurk up to 3.2.0 and classified as critical. This vulnerability affects unknown code of the file psiturk/experiment.py. The manipulation of the argument mode leads to improper neutralization of special elements used in a template engine. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.1 is able to address this issue. The name of the patch is 47787e15cecd66f2aa87687

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-1336, CWE-94
Published	2023-01-28
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: psiturk

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-28 23:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

psiturk psiturk UPGRADE

Affected: < 3.2.1

Fixed in: 3.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy psiturk || rpm -q psiturk || psiturk --version

2. UPGRADE to 3.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade psiturk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade psiturk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4315?

psiturk: upgrade to 3.2.1. Exact commands for each OS are on this page.

Is CVE-2021-4315 being exploited?

CVE-2021-4315 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4315 affect?

CVE-2021-4315 affects psiturk. Severity is medium (CVSS 5.5). A vulnerability has been found in NYUCCL psiTurk up to 3.2.0 and classified as critical. This vulnerability affects unknown code of the file psiturk/experiment.py. The manipulation of the argument mode leads to improper neutralization of sp

How urgent is CVE-2021-4315?

Priority 34/100. No elevated risk signals yet.

References

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