CVE-2022-26259Public exploitNetwork attack vector

Remote code execution via oversized RTSP CSeq

Published Mar 28, 2022 · Updated Aug 3, 2024

Stack buffer overflow in affected Xiongmai DVR firmware allows remote attackers to execute commands through an oversized RTSP CSeq header. The Sofia service uses payloadLen as the strncpy count when copying an RTSP request into a fixed 2,048-byte stack buffer without enforcing its size. Network access to TCP port 554 is sufficient; oversized requests can restart the device, while command execution requires firmware-specific return addresses.

CVSS severity7.8
High
EPSS probability2.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in affected Xiongmai DVR firmware allows remote attackers to execute commands through an oversized RTSP CSeq header. The Sofia service uses payloadLen as the strncpy count when copying an RTSP request into a fixed 2,048-byte stack buffer without enforcing its size. Network access to TCP port 554 is sufficient; oversized requests can restart the device, while command execution requires firmware-specific return addresses.

The record

CVE
CVE-2022-26259
Published
Mar 28, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8XiongmaiCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

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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