CVE-2019-14378: ip_reass in ip_input.c in libslirp 4.0.0 has a heap-based buffer overflow via a large packet because it mishan

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HIGH 8.8DOWNGRADE

CVE-2019-14378 is a high-severity flaw (CVSS 8.8) affecting libslirp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ip_reass in ip_input.c in libslirp 4.0.0 has a heap-based buffer overflow via a large packet because it mishandles a case involving the first fragment.

Why this priority

High severity
EPSS top 3%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	16.7% (top 3%)
CISA exploited list	No
Weakness	CWE-755, CWE-787
Published	2019-07-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libslirp project

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

Am I affected?

Timeline

2019-07-29 11:15 UTCPublished CVE record published
2026-06-17 02:18 UTCUpdated Record last modified

libslirp project libslirp DOWNGRADE

Affected: 4.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison libslirp sudo apt install libslirp=<VERSION_BEFORE_4.0.0> sudo apt-mark hold libslirp

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

dnf --showduplicates list libslirp sudo dnf downgrade libslirp-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add libslirp

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: QEMU - Denial of Service

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-2019-14378?

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

Is CVE-2019-14378 being exploited?

CVE-2019-14378 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-2019-14378 affect?

CVE-2019-14378 affects libslirp. Severity is high (CVSS 8.8). ip_reass in ip_input.c in libslirp 4.0.0 has a heap-based buffer overflow via a large packet because it mishandles a case involving the first fragment.

How urgent is CVE-2019-14378?

Priority 60/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2021-3595 LOW 3.8 UPGRADE MITIGATE An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU
CVE-2021-3594 LOW 3.8 UPGRADE MITIGATE An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU
CVE-2021-3593 LOW 3.8 UPGRADE MITIGATE An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU
CVE-2021-3592 LOW 3.8 UPGRADE MITIGATE An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU
CVE-2020-8608 MEDIUM 5.6 DOWNGRADE MITIGATE In libslirp 4.1.0, as used in QEMU 4.2.0, tcp_subr.c misuses snprintf return values, leading to a buffer overf

References

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