CVE-2019-14378

CVE-2019-14378 is a high-severity vulnerability in Libslirp Project Libslirp with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-755.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• CVSS v2: 6.5
• EPSS exploit prediction: 17% (97th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-755
• Affected product: Libslirp Project Libslirp
• Published: 2019-07-29
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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 mishandles a case involving the first fragment.

How severe is CVE-2019-14378?

CVE-2019-14378 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-14378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-14378?

CVE-2019-14378 affects Libslirp Project Libslirp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-14378?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-14378 published?

CVE-2019-14378 was published on 2019-07-29 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00000.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00008.html
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00034.html
• http://packetstormsecurity.com/files/154269/QEMU-Denial-Of-Service.html
• http://www.openwall.com/lists/oss-security/2019/08/01/2
• https://access.redhat.com/errata/RHSA-2019:3179
• https://access.redhat.com/errata/RHSA-2019:3403
• https://access.redhat.com/errata/RHSA-2019:3494
• https://access.redhat.com/errata/RHSA-2019:3742
• https://access.redhat.com/errata/RHSA-2019:3787
• https://access.redhat.com/errata/RHSA-2019:3968
• https://access.redhat.com/errata/RHSA-2019:4344
• https://access.redhat.com/errata/RHSA-2020:0366
• https://access.redhat.com/errata/RHSA-2020:0775
• https://blog.bi0s.in/2019/08/24/Pwn/VM-Escape/2019-07-29-qemu-vm-escape-cve-2019-14378/
• https://gitlab.freedesktop.org/slirp/libslirp/commit/126c04acbabd7ad32c2b018fe10dfac2a3bc1210
• https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPLHB2AN663OXAWUQURF7J2X5LHD4VD3/
• https://news.ycombinator.com/item?id=20799010
• https://seclists.org/bugtraq/2019/Aug/41
• https://seclists.org/bugtraq/2019/Sep/3
• https://support.f5.com/csp/article/K25423748
• https://support.f5.com/csp/article/K25423748?utm_source=f5support&amp%3Butm_medium=RSS
• https://usn.ubuntu.com/4191-1/
• https://usn.ubuntu.com/4191-2/
• https://www.debian.org/security/2019/dsa-4506
• https://www.debian.org/security/2019/dsa-4512

Affected products (1)

• cpe:2.3:a:libslirp_project:libslirp:4.0.0:*:*:*:*:*:*:*

More vulnerabilities in Libslirp Project Libslirp

• CVE-2020-1983 — High (CVSS 7.5): A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows crafted packets…
• CVE-2020-7211 — High (CVSS 7.5): tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
• CVE-2019-15890 — High (CVSS 7.5): libslirp 4.0.0, as used in QEMU 4.1.0, has a use-after-free in ip_reass in ip_input.c.
• CVE-2020-10756 — Medium (CVSS 6.5): An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator. This flaw…
• CVE-2020-8608 — Medium (CVSS 5.6): In libslirp 4.1.0, as used in QEMU 4.2.0, tcp_subr.c misuses snprintf return values, leading to a buffer overflow in…
• CVE-2020-7039 — Medium (CVSS 5.6): tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as demonstrated by IRC DCC commands…

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• CVE-2021-42141 — Critical (CVSS 9.8): An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. One incorrect handshake could complete with…
• CVE-2023-38406 — Critical (CVSS 9.8): bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."
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