Skip to content
Fencer Vulns
critical 9.8

CVE-2020-14983 json

The server in Chocolate Doom 3.0.0 and Crispy Doom 5.8.0 doesn't validate the user-controlled num_players value, leading to a buffer overfl…

published 2020-06-22 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7113

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

The server in Chocolate Doom 3.0.0 and Crispy Doom 5.8.0 doesn't validate the user-controlled num_players value, leading to a buffer overflow. A malicious user can overwrite the server's stack.

Patch / fix

  • crispy-doom Debian 14, Debian 13, Debian 12 5.9.0-1
  • chocolate-doom Debian 14, Debian 13, Debian 12 3.0.1-1

debian advisories DEBIAN-CVE-2020-14983

  • chocolate-doom Package Hub 15 SP1 3.0.1-bp151.4.3.1
  • chocolate-doom openSUSE Leap 15.2 3.0.1-lp152.4.3.1
  • chocolate-doom openSUSE Leap 15.1 3.0.1-lp151.3.3.1

opensuse advisories openSUSE-SU-2020:0947-1openSUSE-SU-2020:0939-1openSUSE-SU-2020:0928-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-14983 updated cvss 9.1

chocolate-doom: malicious user can overwrite the server's stack leads to DoS

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.69% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/chocolate-doom/chocolate-doom/issues/1293 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.