CVE-2019-19324: Xmidt cjwt through 1.0.1 before 2019-11-25 maps unsupported algorithms to alg=none, which sometimes leads to u

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HIGH 7.5REMOTEUPGRADE

CVE-2019-19324 is a high-severity flaw (CVSS 7.5) affecting cjwt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Xmidt cjwt through 1.0.1 before 2019-11-25 maps unsupported algorithms to alg=none, which sometimes leads to untrusted accidental JWT acceptance.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-670
Published	2020-03-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xmidt

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

Am I affected?

Timeline

2020-03-20 18:15 UTCPublished CVE record published
2026-06-17 02:26 UTCUpdated Record last modified

xmidt cjwt UPGRADE

Affected: >= 1.0.1 and < 2019-11-25

Fixed in: 2019-11-25

Safe to downgrade to: a release before 1.0.1

1. Check installed version

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

2. UPGRADE to 2019-11-25 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cjwt

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 1.0.1 (Debian / Ubuntu)

apt-cache madison cjwt sudo apt install cjwt=<VERSION_BEFORE_1.0.1> sudo apt-mark hold cjwt

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

dnf --showduplicates list cjwt sudo dnf downgrade cjwt-<VERSION_BEFORE_1.0.1> sudo dnf versionlock add cjwt

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-2019-19324?

cjwt: upgrade to 2019-11-25. Exact commands for each OS are on this page.

Is CVE-2019-19324 being exploited?

CVE-2019-19324 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-2019-19324 affect?

CVE-2019-19324 affects cjwt. Severity is high (CVSS 7.5). Xmidt cjwt through 1.0.1 before 2019-11-25 maps unsupported algorithms to alg=none, which sometimes leads to untrusted accidental JWT acceptance.

How urgent is CVE-2019-19324?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

References

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