CVE-2020-5210

Local code execution via unbounded window-type formatting

Published Jan 28, 2020 · Updated Aug 4, 2024

Buffer overflow in NetHack before 3.6.5 allows local users to crash the game or execute code through a malformed -w option. The Unix option parser passes an unbounded window-type argument to choose_windows, which formats it through config_error_add and raw_printf into fixed-size buffers without truncation. Exploitation requires a shared system accepting user-controlled options or configuration files; a suid/sgid installation can turn code execution into privilege escalation.

CVSS severity5.0
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in NetHack before 3.6.5 allows local users to crash the game or execute code through a malformed -w option. The Unix option parser passes an unbounded window-type argument to choose_windows, which formats it through config_error_add and raw_printf into fixed-size buffers without truncation. Exploitation requires a shared system accepting user-controlled options or configuration files; a suid/sgid installation can turn code execution into privilege escalation.

The record

CVE
CVE-2020-5210
Published
Jan 28, 2020
Updated
Aug 4, 2024
Vendor
NetHack
Product
NetHack
Classifications
CWE-120, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

NetHack · NetHackversion=< 3.6.5

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.0GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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