CVE-2022-38393Public exploitNetwork attack vector

Service crash via undersized ConnDiag packet

Published Jan 10, 2023 · Updated Aug 3, 2024

Out-of-bounds read in ASUS RT-AX82U 3.0.0.4.386_49674-ge182230 allows remote attackers to crash cfg_server via a UDP packet. cm_processConnDiagPktList subtracts the 12-byte header from an undersized packet length, underflowing the size passed into repeated EVP_DecryptUpdate calls and causing a wild read. The unauthenticated service listens on UDP port 7788 by default; reaching it can terminate cfg_server, interrupting router configuration and AiMesh diagnostics.

CVSS severity7.5
High
EPSS probability18.85%
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 read in ASUS RT-AX82U 3.0.0.4.386_49674-ge182230 allows remote attackers to crash cfg_server via a UDP packet. cm_processConnDiagPktList subtracts the 12-byte header from an undersized packet length, underflowing the size passed into repeated EVP_DecryptUpdate calls and causing a wild read. The unauthenticated service listens on UDP port 7788 by default; reaching it can terminate cfg_server, interrupting router configuration and AiMesh diagnostics.

The record

CVE
CVE-2022-38393
Published
Jan 10, 2023
Updated
Aug 3, 2024
Vendor
ASUSTeK Computer Inc.
Product
ASUS RT-AX82U
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2023CVE 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?

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

  1. Affected versionversion=3.0.0.4.386_49674-ge182230

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ASUSTeK Computer Inc. · ASUS RT-AX82Uversion=3.0.0.4.386_49674-ge182230

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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