CVE-2022-28711Network attack vector

Memory overwrite via truncated percent encoding

Published Apr 14, 2022 · Updated Apr 15, 2025

Memory corruption in ArduPilot APWeb commits 50b6b7ac through 46177cb9 allows remote attackers to overwrite memory via crafted HTTP requests. The cgi.c unescape function accepts a percent sign without ensuring that two following bytes exist, then copies from p+3 and accesses memory beyond the string boundary. No authentication or user interaction is required; malformed URL-encoded input can overwrite process memory, with no published confidentiality or availability impact.

CVSS severity5.3
Medium
EPSS probability1.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in ArduPilot APWeb commits 50b6b7ac through 46177cb9 allows remote attackers to overwrite memory via crafted HTTP requests. The cgi.c unescape function accepts a percent sign without ensuring that two following bytes exist, then copies from p+3 and accesses memory beyond the string boundary. No authentication or user interaction is required; malformed URL-encoded input can overwrite process memory, with no published confidentiality or availability impact.

The record

CVE
CVE-2022-28711
Published
Apr 14, 2022
Updated
Apr 15, 2025
Vendor
ArduPilot
Product
APWeb
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record 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=master commit 50b6b7ac - master commit 46177cb9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ArduPilot · APWebversion=master commit 50b6b7ac - master commit 46177cb9

Published CVSS scores

5.3Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

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

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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