CVE-2022-34983: The scu-captcha package in PyPI v0.0.1 to v0.0.4 included a code execution backdoor inserted by a third party.

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CRITICAL 9.8REMOTEUPGRADE

CVE-2022-34983 is a critical-severity flaw (CVSS 9.8) affecting scu-captcha. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The scu-captcha package in PyPI v0.0.1 to v0.0.4 included a code execution backdoor inserted by a third party.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2022-07-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: scu-captcha project

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

Am I affected?

Timeline

2022-07-22 15:15 UTCPublished CVE record published
2026-06-17 04:51 UTCUpdated Record last modified

scu-captcha project scu-captcha UPGRADE

Affected: >= 0.0.1 and <= 0.0.4

Fixed in: newer than 0.0.4

Safe to downgrade to: a release before 0.0.1

1. Check installed version

apt-cache policy scu-captcha || rpm -q scu-captcha || scu-captcha --version

2. UPGRADE to newer than 0.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade scu-captcha

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade scu-captcha

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.0.1 (Debian / Ubuntu)

apt-cache madison scu-captcha sudo apt install scu-captcha=<VERSION_BEFORE_0.0.1> sudo apt-mark hold scu-captcha

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list scu-captcha sudo dnf downgrade scu-captcha-<VERSION_BEFORE_0.0.1> sudo dnf versionlock add scu-captcha

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-34983?

scu-captcha: upgrade to newer than 0.0.4. Exact commands for each OS are on this page.

Is CVE-2022-34983 being exploited?

CVE-2022-34983 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-2022-34983 affect?

CVE-2022-34983 affects scu-captcha. Severity is critical (CVSS 9.8). The scu-captcha package in PyPI v0.0.1 to v0.0.4 included a code execution backdoor inserted by a third party.

How urgent is CVE-2022-34983?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PyPI packages vulnerabilities

References

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