CVE-2023-40706Network attack vector

Unauthorized access via unrestricted password guessing

Published Aug 24, 2023 · Updated Oct 2, 2024

Authentication throttling failure in Opto 22 SNAP PAC S1 R10.3b allows remote attackers to brute-force the built-in web server login. The built-in web server accepts unlimited consecutive password attempts without rate limiting or account lockout. Network access to TCP/443 and a guessable credential are required; successful guessing grants unauthorized access to web-served data.

CVSS severity8.6
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication throttling failure in Opto 22 SNAP PAC S1 R10.3b allows remote attackers to brute-force the built-in web server login. The built-in web server accepts unlimited consecutive password attempts without rate limiting or account lockout. Network access to TCP/443 and a guessable credential are required; successful guessing grants unauthorized access to web-served data.

The record

CVE
CVE-2023-40706
Published
Aug 24, 2023
Updated
Oct 2, 2024
Vendor
Opto 22
Product
SNAP PAC S1
Classifications
CWE-307, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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=r10.3b
  2. Affected versionversion=R10.3b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Opto 22 · SNAP PAC S1version=r10.3b; version=R10.3b

Published CVSS scores

8.6Dragos, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 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-307Improper Restriction of Excessive Authentication Attempts
T1110.001Brute Force: Password Guessing

Public exploit references

No public exploit references are available in this record.

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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