CVE-2021-37778Public exploit

Code execution via unchecked command-line argument copies

Published Jun 30, 2022 · Updated Aug 4, 2024

Buffer overflow in the option parser in gps-sdr-sim 1.0 allows local users to execute code or crash via oversized command-line arguments. The parser copies -e, -u, -g, and -o argument strings into fixed 100-byte navfile, umfile, and outfile buffers with strcpy and no length check. Exploitation requires local ability to invoke the console program with crafted arguments; successful corruption can terminate the process or execute code in its security context.

CVSS severity9.8
Critical
EPSS probability1.64%
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 the option parser in gps-sdr-sim 1.0 allows local users to execute code or crash via oversized command-line arguments. The parser copies -e, -u, -g, and -o argument strings into fixed 100-byte navfile, umfile, and outfile buffers with strcpy and no length check. Exploitation requires local ability to invoke the console program with crafted arguments; successful corruption can terminate the process or execute code in its security context.

The record

CVE
CVE-2021-37778
Published
Jun 30, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1203
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 30, 2022CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

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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