CVE-2014-8399: The default configuration in systemd-shim 8 enables the Abandon debugging clause, which allows local users to

Routine

LOW 2.1DOWNGRADE

CVE-2014-8399 is a low-severity flaw (CVSS 2.1) affecting shim. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The default configuration in systemd-shim 8 enables the Abandon debugging clause, which allows local users to cause a denial of service via unspecified vectors.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Published	2014-10-31
Last modified	2026-06-17

Publisher (CNA): Canonical Ltd. · Vendor: shim project

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

Am I affected?

Timeline

2014-10-31 14:55 UTCPublished CVE record published
2026-06-17 00:16 UTCUpdated Record last modified

shim project shim DOWNGRADE

Affected: 8

Fixed in: no fixed release known

Safe to downgrade to: a release before 8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 8 (Debian / Ubuntu)

apt-cache madison shim sudo apt install shim=<VERSION_BEFORE_8> sudo apt-mark hold shim

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

dnf --showduplicates list shim sudo dnf downgrade shim-<VERSION_BEFORE_8> sudo dnf versionlock add shim

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-2014-8399?

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

Is CVE-2014-8399 being exploited?

CVE-2014-8399 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-2014-8399 affect?

CVE-2014-8399 affects shim. Severity is low (CVSS 2.1). The default configuration in systemd-shim 8 enables the Abandon debugging clause, which allows local users to cause a denial of service via unspecified vectors.

How urgent is CVE-2014-8399?

Priority 22/100. Public exploit reference

Related CVEs

CVE-2023-40548 HIGH 7.4 UPGRADE MITIGATE A buffer overflow was found in Shim in the 32-bit system
CVE-2023-40547 HIGH 8.3 UPGRADE MITIGATE A remote code execution vulnerability was found in Shim
CVE-2023-40551 MEDIUM 5.1 UPGRADE MITIGATE A flaw was found in the MZ binary format in Shim
CVE-2023-40550 MEDIUM 5.5 UPGRADE MITIGATE An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information
CVE-2023-40549 MEDIUM 6.2 UPGRADE MITIGATE An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the load o

References

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