CVE-2021-23448: All versions of package config-handler are vulnerable to Prototype Pollution when loading config files.

This week

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2021-23448 is a medium-severity flaw (CVSS 6.5) affecting config-handler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of package config-handler are vulnerable to Prototype Pollution when loading config files.

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-1321
Published	2021-10-11
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: config-handler project

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

Am I affected?

Timeline

2021-10-11 21:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

config-handler project config-handler DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy config-handler || rpm -q config-handler || config-handler --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison config-handler sudo apt install config-handler=<VERSION_BEFORE_1.0.0> sudo apt-mark hold config-handler

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list config-handler sudo dnf downgrade config-handler-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add config-handler

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-2021-23448?

config-handler: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-23448 being exploited?

CVE-2021-23448 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-2021-23448 affect?

CVE-2021-23448 affects config-handler. Severity is medium (CVSS 6.5). All versions of package config-handler are vulnerable to Prototype Pollution when loading config files.

How urgent is CVE-2021-23448?

Priority 50/100. Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs