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Vulnerabilities

Vulnerability · CVE-2020-8608

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 later code.

Published Feb 6, 2020 · catalog updated Oct 26, 2026 · In libslirp 4.1.0, as

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-8608. EPSS is 2.49%. Act only if a listed version of In libslirp 4.1.0, as is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In libslirp 4.1.0, as).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.49%
Remediation
Advisory link
Affected products
Debian:12 libslirp · Debian:12 qemu · Debian:12 slirp · Debian:12 slirp4netns · Debian:13 libslirp · Debian:13 qemu

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 later code.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 libslirp0 → 4.2.0-1
  • Debian:12 qemu0 → 1:4.1-2
  • Debian:12 slirp0 → 1:1.0.17-11
  • Debian:12 slirp4netns0 → 1.0.1-1
  • Debian:13 libslirp0 → 4.2.0-1
  • Debian:13 qemu0 → 1:4.1-2
  • Debian:13 slirp0 → 1:1.0.17-11
  • Debian:13 slirp4netns0 → 1.0.1-1
  • Debian:14 libslirp0 → 4.2.0-1
  • Debian:14 qemu0 → 1:4.1-2
  • Debian:14 slirp0 → 1:1.0.17-11
  • Debian:14 slirp4netns0 → 1.0.1-1

How to fix CVE-2020-8608

  • Upgrade

    CVE-2020-8608 lists a fix boundary at 4.2.0-1. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 4.2.0-1 · 5 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-8608. EPSS is 2.49%. Act only if a listed version of In libslirp 4.1.0, as is installed.

Which versions are affected?

Compare what you have installed with 0 → 4.2.0-1, 0 → 1:4.1-2, 0 → 1:1.0.17-11, 0 → 1.0.1-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 2.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 6, 2020 · OpenSSF OSV / OSV Scanner

    Detected

    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 later code.

  2. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libslirp fixed in 4.2.0-1; libslirp fixed in 4.2.0-1; libslirp fixed in 4.2.0-1; qemu fixed in 1:4.1-2

  3. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libslirp fixed in 4.2.0-1

  4. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    qemu fixed in 1:4.1-2

  5. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    slirp fixed in 1:1.0.17-11

  6. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    slirp4netns fixed in 1.0.1-1

  7. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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 later code.

Sources

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • OpenSSF OSV / OSV ScannerOct 26, 2026