Cyber Resilience

CVE-2023-5959

Auth Bypass in Byzoro Smart S85F Firmware v31r02b10-01

Public PoCAuth Bypass
Published
11 November 2023
Modified
21 November 2024
CVSS Score v3.1 4.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS Score 0.0088 56th percentile
Risk Priority 39 floored blend · peak EPSS

Summary

CVE-2023-5959 is a medium-severity Weak Password Recovery Mechanism for Forgotten Password (CWE-640) vulnerability in Byzoro Smart S85F Firmware. Its CVSS base score is 4.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Valid Accounts (T1078); ranked in the top 44% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

A vulnerability, which was classified as problematic, was found in Byzoro Smart S85F Management Platform V31R02B10-01. Affected is an unknown function of the file /login.php. The manipulation of the argument txt_newpwd leads to weak password recovery. The exploit has been…

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disclosed to the public and may be used. The identifier of this vulnerability is VDB-244992. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

CWE(s)
CWE-640

Related Threats

MITRE ATT&CK Enterprise Techniques

T1078 Valid Accounts Stealth
Adversaries may obtain and abuse credentials of existing accounts as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.
attack.mitre.org →
T1110 Brute Force Credential Access
Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.
attack.mitre.org →
T1110.001 Password Guessing Credential Access
Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-4739Same product: Byzoro Smart S85F
CVE-2023-5684Same product: Byzoro Smart S85F
CVE-2023-5683Same product: Byzoro Smart S85F
CVE-2023-4120Same product: Byzoro Smart S85F
CVE-2023-4414Same product: Byzoro Smart S85F
CVE-2023-4121Same product: Byzoro Smart S85F
CVE-2024-0186Shared CWE-640
CVE-2025-50433Shared CWE-640
CVE-2023-43650Shared CWE-640
CVE-2026-9273Shared CWE-640

Affected Assets

byzoro
smart s85f firmware
v31r02b10-01

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V7.4.3

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

IA-5 Authenticator Management
addresses: CWE-640

Establishing procedures for lost or compromised authenticators addresses weak password recovery mechanisms.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-01 mostly match
prevents

Credential lifecycle management directly includes password reset/recovery flows.

PR.AA-02 mostly match
prevents

Identity proofing is the core control that prevents weak or bypassed recovery mechanisms.

PR.AA-03 partial match
prevents

Authentication policy covers strength/MFA but does not address recovery path weaknesses.

PR.PS-06 partial match
prevents

Secure SDLC reduces implementation flaws but is not specific to password-recovery design.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.17 Authentication information partial match
degrades

Strong authentication-information lifecycle rules directly address weak password-recovery flows.

A.8.25 Secure development life cycle partial match
prevents

Secure-SDLC practices can embed strong recovery design, yet the control is broader than this single weakness.

A.8.26 Application security requirements partial match
prevents

Application-security requirements can mandate secure recovery flows, but the control covers many other requirements.

A.8.28 Secure coding partial match
prevents

Secure-coding standards can prevent weak recovery implementations, yet the control is wider in scope.

A.8.5 Secure authentication partial match
mitigates

Secure-authentication requirements include robust forgotten-password procedures.

A.5.18 Access rights none match
none

Proper access-rights provisioning can limit who can trigger recovery, but does not fix the recovery mechanism itself.

References