CVE-2023-0433: Heap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.1225.

Q: How do I fix CVE-2023-0433?

macos: upgrade to 11.7.5, 12.6.4, 13.3; fedora: mitigate or apply the listed mitigation; neovim: upgrade to 0.8.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-0433 being exploited?

CVE-2023-0433 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-2023-0433 affect?

CVE-2023-0433 affects macos, fedora, neovim. Severity is high (CVSS 7.8). Heap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.1225.

Q: How urgent is CVE-2023-0433?

Priority 43/100. High severity; Public exploit reference

This month

HIGH 7.8UPGRADEMITIGATEUPGRADE

CVE-2023-0433 is a high-severity flaw (CVSS 7.8) affecting macos, fedora, neovim. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.1225.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-122
Published	2023-01-21
Last modified	2026-09-24

Publisher (CNA): huntr.dev · Vendor: apple · fedoraproject · neovim · vim

Last updated 2026-09-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-21 15:15 UTCPublished CVE record published
2026-09-24 15:54 UTCUpdated Record last modified

apple macos UPGRADE

Affected: < 11.7.5 · >= 12.0.0 and < 12.6.4 · >= 13.0 and < 13.3

Fixed in: 11.7.5, 12.6.4, 13.3

Safe to downgrade to: a release before 12.0.0

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.

fedoraproject fedora MITIGATE

Affected: 36 · 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 36

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.

neovim neovim UPGRADE

Affected: >= 0.1.0 and < 0.8.3

Fixed in: 0.8.3

Safe to downgrade to: a release before 0.1.0

1. Check installed version

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

2. UPGRADE to 0.8.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade neovim

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 0.1.0 (Debian / Ubuntu)

apt-cache madison neovim sudo apt install neovim=<VERSION_BEFORE_0.1.0> sudo apt-mark hold neovim

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

dnf --showduplicates list neovim sudo dnf downgrade neovim-<VERSION_BEFORE_0.1.0> sudo dnf versionlock add neovim

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.

vim vim UPGRADE

Affected: < 9.0.1225

Fixed in: 9.0.1225

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.0.1225 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vim

Note

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

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-2023-0433?

macos: upgrade to 11.7.5, 12.6.4, 13.3; fedora: mitigate or apply the listed mitigation; neovim: upgrade to 0.8.3. Exact commands for each OS are on this page.

Is CVE-2023-0433 being exploited?

CVE-2023-0433 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-2023-0433 affect?

CVE-2023-0433 affects macos, fedora, neovim. Severity is high (CVSS 7.8). Heap-based Buffer Overflow in GitHub repository vim/vim prior to 9.0.1225.

How urgent is CVE-2023-0433?

Priority 43/100. High severity; Public exploit reference

Software pages

GitHub vulnerabilities · macOS vulnerabilities · Vim vulnerabilities

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References

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