CVE-2022-21217Network attack vector

Memory corruption via unterminated email recipient fields

Published Jan 28, 2022 · Updated Apr 15, 2025

Out-of-bounds write in Reolink RLC-410W 3.0.0.136_20121102 allows remote authenticated users to corrupt memory via a crafted HTTP request. TestEmail_API copies 127-byte recipient strings with strncpy into uninitialized stack fields without ensuring NUL termination, causing concatenate_recipients to overrun its stack destination. Administrator access to TestEmail is required; successful exploitation corrupts stack memory while constructing the recipient list.

CVSS severity9.8
Critical
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Reolink RLC-410W 3.0.0.136_20121102 allows remote authenticated users to corrupt memory via a crafted HTTP request. TestEmail_API copies 127-byte recipient strings with strncpy into uninitialized stack fields without ensuring NUL termination, causing concatenate_recipients to overrun its stack destination. Administrator access to TestEmail is required; successful exploitation corrupts stack memory while constructing the recipient list.

The record

CVE
CVE-2022-21217
Published
Jan 28, 2022
Updated
Apr 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-457, CWE-787
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 28, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

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
9.1Cisco TalosCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-457Use of Uninitialized Variable
CWE-787Out-of-bounds Write

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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