CVE-2024-30949: An issue in newlib v.4.3.0 allows an attacker to execute arbitrary code via the time unit scaling in the _gett

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2024-30949 is a critical-severity flaw (CVSS 9.8) affecting newlib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in newlib v.4.3.0 allows an attacker to execute arbitrary code via the time unit scaling in the _gettimeofday function.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-190, CWE-787
Published	2024-08-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: newlib project

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

Am I affected?

Timeline

2024-08-20 15:15 UTCPublished CVE record published
2026-06-17 07:27 UTCUpdated Record last modified

newlib project newlib DOWNGRADE

Affected: 4.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.3.0 (Debian / Ubuntu)

apt-cache madison newlib sudo apt install newlib=<VERSION_BEFORE_4.3.0> sudo apt-mark hold newlib

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

dnf --showduplicates list newlib sudo dnf downgrade newlib-<VERSION_BEFORE_4.3.0> sudo dnf versionlock add newlib

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-2024-30949?

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

Is CVE-2024-30949 being exploited?

CVE-2024-30949 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-2024-30949 affect?

CVE-2024-30949 affects newlib. Severity is critical (CVSS 9.8). An issue in newlib v.4.3.0 allows an attacker to execute arbitrary code via the time unit scaling in the _gettimeofday function.

How urgent is CVE-2024-30949?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

References

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