CVE-2023-23449

Sick Ftmg-Esd20Axx Firmware ≤ 2.0

Published

15 May 2023

Modified

01 June 2026

Patch / advisory

View advisory

CVSS Score v3.1 5.3

Click a component to see what it means

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Score 0.0078 55th percentile

Risk Priority 46 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-23449 is a medium-severity Observable Response Discrepancy (CWE-204) vulnerability in Sick Ftmg-Esd20Axx Firmware. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Steganography (T1001.002); ranked in the top 45% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2023-27549

Vulnerability Data

Observable Response Discrepancy in SICK FTMg AIR FLOW SENSOR with Partnumbers 1100214, 1100215, 1100216, 1120114, 1120116, 1122524, 1122526 allows a remote attacker to gain information about valid usernames by analyzing challenge responses from the server via the REST interface.

CWE(s): CWE-204 CWE-203

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.002 Steganography Command And Control

Adversaries may use steganographic techniques to hide command and control traffic to make detection efforts more difficult.

attack.mitre.org →

T1003.003 NTDS Credential Access

Adversaries may attempt to access or create a copy of the Active Directory domain database in order to steal credential information, as well as obtain other information about domain members such as devices, users, and access rights.

attack.mitre.org →

T1003.004 LSA Secrets Credential Access

Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.

attack.mitre.org →

T1003.007 Proc Filesystem Credential Access

Adversaries may gather credentials from the proc filesystem or `/proc`.

attack.mitre.org →

T1011 Exfiltration Over Other Network Medium Exfiltration

Adversaries may attempt to exfiltrate data over a different network medium than the command and control channel.

attack.mitre.org →

T1011.001 Exfiltration Over Bluetooth Exfiltration

Adversaries may attempt to exfiltrate data over Bluetooth rather than the command and control channel.

attack.mitre.org →

Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-23447Same product: Sick Ftmg-Esd15Axx

CVE-2023-23448Same product: Sick Ftmg-Esd15Axx

CVE-2023-31408Same product: Sick Ftmg-Esd15Axx

CVE-2023-23445Same product: Sick Ftmg-Esd15Axx

CVE-2023-35698Same vendor: Sick

CVE-2023-23446Same product: Sick Ftmg-Esd15Axx

CVE-2023-31409Same product: Sick Ftmg-Esd15Axx

CVE-2023-23450Same product: Sick Ftmg-Esd15Axx

CVE-2025-58586Same vendor: Sick

CVE-2025-49187Same vendor: Sick

Affected Assets

sick

ftmg-esd20axx firmware

≤ 2.0

sick

ftmg-esd25axx firmware

≤ 2.0

sick

ftmg-esn40sxx firmware

≤ 2.0

sick

ftmg-esn50sxx firmware

≤ 2.0

sick

ftmg-esr50sxx firmware

≤ 2.0

sick

ftmg-esr40sxx firmware

≤ 2.0

sick

ftmg-esd15axx firmware

≤ 2.0

Mitigating Controls

Control response

Prevent

Stop it (NIST 800-53)

—

Detect

Catch it (NIST detect / respond)

—

Harden

Shrink the surface (DISA STIG)

1 hardening rule · 1 OS baseline

Validate

Prove the fix (OWASP ASVS)

V13.4.5

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.

SC-30 Concealment and Misdirection

addresses: CWE-203 CWE-204

Misdirection can normalize or falsify responses to eliminate observable discrepancies that aid reconnaissance.

SI-11 Error Handling

addresses: CWE-203 CWE-204

Prevents attackers from using observable differences in error responses to infer internal system details or state.

SC-31 Covert Channel Analysis

addresses: CWE-203

Observable discrepancies in system behavior can be modulated to create covert storage or timing channels; the required analysis detects and constrains such avenues.

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.PS-06 partial match

blocks

Secure SDLC practices directly prevent introduction of inconsistent response behavior that leaks internal state.

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.5.14 Information transfer partial match

removes

A.5.15 Access control partial match

removes

A.5.16 Identity management partial match

removes

A.5.17 Authentication information partial match

removes

A.5.18 Access rights partial match

removes

A.6.8 Information security event reporting partial match

removes