CVE-2023-1672: A race condition exists in the Tang server functionality for key generation and key rotation

Q: How do I fix CVE-2023-1672?

tang: upgrade to 14; fedora: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-1672 being exploited?

CVE-2023-1672 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-2023-1672 affect?

CVE-2023-1672 affects tang, fedora, enterprise linux. Severity is medium (CVSS 5.3). A race condition exists in the Tang server functionality for key generation and key rotation. This flaw results in a small time window where Tang private keys become readable by other processes on the same host.

Q: How urgent is CVE-2023-1672?

Priority 40/100. Public exploit reference; On your watchlist

This month

MEDIUM 5.3WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2023-1672 is a medium-severity flaw (CVSS 5.3) affecting tang, fedora, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A race condition exists in the Tang server functionality for key generation and key rotation. This flaw results in a small time window where Tang private keys become readable by other processes on the same host.

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-362
Published	2023-07-11
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · redhat · tang project

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

Am I affected?

Timeline

2023-07-11 12:15 UTCPublished CVE record published
2026-06-17 05:28 UTCUpdated Record last modified

tang project tang UPGRADE

Affected: < 14

Fixed in: 14

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 14 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tang

Note

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

fedoraproject fedora MITIGATE

Affected: 38

Fixed in: no fixed release known

Safe to downgrade to: a release before 38

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2023-1672?

tang: upgrade to 14; fedora: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-1672 being exploited?

CVE-2023-1672 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-2023-1672 affect?

CVE-2023-1672 affects tang, fedora, enterprise linux. Severity is medium (CVSS 5.3). A race condition exists in the Tang server functionality for key generation and key rotation. This flaw results in a small time window where Tang private keys become readable by other processes on the same host.

How urgent is CVE-2023-1672?

Priority 40/100. Public exploit reference; On your watchlist

References

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