CVE-2023-4813: A flaw has been identified in glibc

Q: How do I fix CVE-2023-4813?

glibc: upgrade to 2.36; enterprise linux: mitigate or apply the listed mitigation; enterprise linux eus: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-4813 being exploited?

CVE-2023-4813 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-2023-4813 affect?

CVE-2023-4813 affects glibc, enterprise linux, enterprise linux eus. Severity is medium (CVSS 5.9). A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash. This issue is only exploitable when the getaddrinfo function is called and the host

Q: How urgent is CVE-2023-4813?

Priority 51/100. Remotely exploitable, no login, no user action; On your watchlist

This month

MEDIUM 5.9REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2023-4813 is a medium-severity flaw (CVSS 5.9) affecting glibc, enterprise linux, enterprise linux eus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash. This issue is only exploitable when the getaddrinfo function is called and the hosts database in /etc/nsswitch.conf is configured with SUCCESS=continue or SUCCESS=merge.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-416
Published	2023-09-12
Last modified	2026-10-30

Publisher (CNA): Red Hat, Inc. · Vendor: gnu · redhat

Last updated 2026-10-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-09-12 22:15 UTCPublished CVE record published
2026-10-30 19:17 UTCUpdated Record last modified

gnu glibc UPGRADE

Affected: < 2.36

Fixed in: 2.36

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.36 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade glibc

Note

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

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.

redhat enterprise linux eus MITIGATE

Affected: 8.8 · 9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.8

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 for ibm z systems eus s390x MITIGATE

Affected: 9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.2

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 for ibm z systems s390x MITIGATE

Affected: 9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.2

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 for power little endian MITIGATE

Affected: 9.2_ppc64le

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.2_ppc64le

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-2023-4813?

glibc: upgrade to 2.36; enterprise linux: mitigate or apply the listed mitigation; enterprise linux eus: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-4813 being exploited?

CVE-2023-4813 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-2023-4813 affect?

CVE-2023-4813 affects glibc, enterprise linux, enterprise linux eus. Severity is medium (CVSS 5.9). A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash. This issue is only exploitable when the getaddrinfo function is called and the host

How urgent is CVE-2023-4813?

Priority 51/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

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References

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