CVE-2022-46143Network attack vector

Authenticated memory disclosure via unchecked TFTP blocksize

Published Dec 13, 2022 · Updated Jan 14, 2025

Improper TFTP input validation in Siemens SCALANCE and RUGGEDCOM firmware allows remote authenticated users to read residual memory data. The TFTP request handler accepts a negotiated blocksize without correctly validating the specified quantity, then returns bytes from an uninitialized buffer that can retain previously allocated data. Administrative privileges and network reachability to TFTP are required; the documented impact is limited to disclosure of residual data.

CVSS severity2.7
Low
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper TFTP input validation in Siemens SCALANCE and RUGGEDCOM firmware allows remote authenticated users to read residual memory data. The TFTP request handler accepts a negotiated blocksize without correctly validating the specified quantity, then returns bytes from an uninitialized buffer that can retain previously allocated data. Administrative privileges and network reachability to TFTP are required; the documented impact is limited to disclosure of residual data.

The record

CVE
CVE-2022-46143
Published
Dec 13, 2022
Updated
Jan 14, 2025
Vendor
Siemens
Product
SCALANCE XR328-4C WG (24xFE, 4xGE, DC24V)
Classifications
CWE-1284, T1212
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <V4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Siemens · SCALANCE XR328-4C WG (24xFE, 4xGE, DC24V)version=0 <V4.4
Siemens · SCALANCE WUM763-1 (US)version=0 <V3.0.0
Siemens · SCALANCE WAM766-1 EEC (ME)version=0 <V3.0.0
Siemens · SCALANCE XR526-8C, 2x230Vversion=0 <V6.6
Siemens · SCALANCE XC208G (EIP def.)version=0 <V4.4
Siemens · SCALANCE XB213-3LD (SC, E/IP)version=0 <V4.4
Siemens · SCALANCE XC208G PoEversion=0 <V4.4
Siemens · SCALANCE XR524-8C, 1x230Vversion=0 <V6.6
Siemens · SCALANCE SC632-2Cversion=0 <V2.3; version=V2.3 <V3.0
Siemens · SCALANCE XC208Gversion=0 <V4.4
Siemens · SCALANCE XR328-4C WG (24xFE, 4xGE, AC230V)version=0 <V4.4
Siemens · SCALANCE XR528-6M (L3 int.)version=0 <V6.6
Siemens · SCALANCE WUB762-1version=0 <V3.0.0
Siemens · SCALANCE XR526-8C, 1x230V (L3 int.)version=0 <V6.6
Siemens · SCALANCE W786-2 RJ45version=0 <*
Siemens · SCALANCE MUM856-1 (RoW)version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE XR324WGversion=0 <V4.4
Siemens · SCALANCE WUB762-1 iFeaturesversion=0 <V3.0.0
Siemens · SCALANCE W786-2IA RJ45version=0 <*
Siemens · SCALANCE SC622-2Cversion=0 <V2.3; version=V2.3 <V3.0
Siemens · SCALANCE XC206-2 (ST/BFOC)version=0 <V4.4
Siemens · SCALANCE XC206-2SFP G (EIP DEF.)version=0 <V4.4
Siemens · SCALANCE W721-1 RJ45version=0 <*
Siemens · SCALANCE XP208EECversion=0 <V4.4
Siemens · SCALANCE W778-1 M12 EECversion=0 <*
Siemens · SCALANCE XC206-2SFP Gversion=0 <V4.4
Siemens · SCALANCE XM416-4Cversion=0 <V6.6
Siemens · SCALANCE W761-1 RJ45version=0 <*
Siemens · SCALANCE MUM856-1 (EU)version=0 <V7.2; version=0 <V8.0
Siemens · SIPLUS NET SCALANCE XC208version=0 <V4.4
Siemens · SCALANCE XC216-4C G (EIP Def.)version=0 <V4.4
Siemens · SCALANCE XB205-3 (ST, PN)version=0 <V4.4
Siemens · SCALANCE W722-1 RJ45version=0 <*
Siemens · SCALANCE XP216 (Ethernet/IP)version=0 <V4.4
Siemens · SCALANCE W748-1 RJ45version=0 <*
Siemens · SCALANCE XC224-4C G (EIP Def.)version=0 <V4.4
Siemens · SCALANCE XR328-4C WG (28xGE, DC 24V)version=0 <V4.4
Siemens · SCALANCE SC626-2Cversion=0 <V2.3; version=V2.3 <V3.0
Siemens · SCALANCE W788-1 RJ45version=0 <*
Siemens · SCALANCE WAM766-1 (US)version=0 <V3.0.0
Siemens · SCALANCE XB213-3LD (SC, PN)version=0 <V4.4
Siemens · RUGGEDCOM RM1224 LTE(4G) NAMversion=0 <V7.2; version=0 <V8.0
Siemens · RUGGEDCOM RM1224 LTE(4G) EUversion=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE W774-1 M12 EECversion=0 <*
Siemens · SCALANCE XC208G EECversion=0 <V4.4
Siemens · SCALANCE WUM766-1version=0 <V3.0.0
Siemens · SCALANCE XR526-8C, 2x230V (L3 int.)version=0 <V6.6
Siemens · SCALANCE XF204-2BAversion=0 <V4.4
Siemens · SCALANCE XP216version=0 <V4.4
Siemens · SCALANCE M874-3version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE W1748-1 M12version=0 <*
Siemens · SCALANCE XC216-4Cversion=0 <V4.4
Siemens · SCALANCE XR524-8C, 2x230Vversion=0 <V6.6
Siemens · SCALANCE WAM763-1version=0 <V3.0.0
Siemens · SCALANCE XC206-2SFPversion=0 <V4.4
Siemens · SCALANCE SC642-2Cversion=0 <V2.3; version=V2.3 <V3.0
Siemens · SCALANCE XF204 DNAversion=0 <V4.4
Siemens · SCALANCE XC216version=0 <V4.4
Siemens · SCALANCE XC206-2SFP G EECversion=0 <V4.4
Siemens · SCALANCE XB205-3 (ST, E/IP)version=0 <V4.4
Siemens · SCALANCE W1788-2IA M12version=0 <*
Siemens · SCALANCE XC216EECversion=0 <V4.4
Siemens · SCALANCE XR552-12M (2HR2)version=0 <V6.6
Siemens · SCALANCE WAM766-1version=0 <V3.0.0
Siemens · SCALANCE XC216-4C Gversion=0 <V4.4
Siemens · SCALANCE W778-1 M12 EEC (USA)version=0 <*
Siemens · SCALANCE W734-1 RJ45version=0 <*
Siemens · SCALANCE XB213-3 (SC, PN)version=0 <V4.4
Siemens · SCALANCE XB205-3LD (SC, E/IP)version=0 <V4.4
Siemens · SCALANCE M812-1 ADSL Routerversion=0 <V7.2; version=0 <V8.0
Siemens · SIPLUS NET SCALANCE XC206-2version=0 <V4.4
Siemens · SCALANCE XC216-3G PoEversion=0 <V4.4
Siemens · SCALANCE S615 EEC LAN Routerversion=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE XC206-2 (SC)version=0 <V4.4
Siemens · SCALANCE XC208EECversion=0 <V4.4
Siemens · SCALANCE XP208version=0 <V4.4
Siemens · SCALANCE WUM766-1 (ME)version=0 <V3.0.0
Siemens · SCALANCE M826-2 SHDSL-Routerversion=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE M816-1 ADSL Routerversion=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE W788-2 M12version=0 <*
Siemens · SCALANCE XR524-8C, 1x230V (L3 int.)version=0 <V6.6
Siemens · SCALANCE M876-3 (ROK)version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE XR528-6M (2HR2)version=0 <V6.6
Siemens · SCALANCE W788-2 M12 EECversion=0 <*
Siemens · SCALANCE XP208 (Ethernet/IP)version=0 <V4.4
Siemens · SCALANCE XR528-6Mversion=0 <V6.6
Siemens · SCALANCE XM408-4C (L3 int.)version=0 <V6.6
Siemens · SCALANCE XM408-8C (L3 int.)version=0 <V6.6
Siemens · SCALANCE M876-3version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE XR526-8C, 24V (L3 int.)version=0 <V6.6
Siemens · SCALANCE XC206-2G PoE (54 V DC)version=0 <V4.4
Siemens · SIPLUS NET SCALANCE XC216-4Cversion=0 <V4.4
Siemens · SCALANCE XC216-4C G EECversion=0 <V4.4
Siemens · SCALANCE XB205-3 (SC, PN)version=0 <V4.4
Siemens · SCALANCE WAM766-1 EECversion=0 <V3.0.0
Siemens · SCALANCE XC224-4C Gversion=0 <V4.4
Siemens · SCALANCE XB216 (PN)version=0 <V4.4
Siemens · SCALANCE XR526-8C, 1x230Vversion=0 <V6.6
Siemens · SCALANCE XP208PoE EECversion=0 <V4.4
Siemens · SCALANCE XR524-8C, 24Vversion=0 <V6.6
Siemens · SCALANCE XR552-12M (2HR2, L3 int.)version=0 <V6.6
Siemens · SCALANCE XB208 (E/IP)version=0 <V4.4
Siemens · SCALANCE M804PBversion=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE XM416-4C (L3 int.)version=0 <V6.6
Siemens · SCALANCE XR328-4C WG (28xGE, AC 230V)version=0 <V4.4
Siemens · SCALANCE XF204version=0 <V4.4
Siemens · SCALANCE XR326-2C PoE WGversion=0 <V4.4
Siemens · SCALANCE W774-1 RJ45 (USA)version=0 <*
Siemens · SCALANCE XC208version=0 <V4.4
Siemens · SCALANCE WAM766-1 EEC (US)version=0 <V3.0.0
Siemens · SCALANCE XC224version=0 <V4.4
Siemens · SCALANCE XR526-8C, 24Vversion=0 <V6.6
Siemens · SCALANCE XC224-4C G EECversion=0 <V4.4
Siemens · SCALANCE W774-1 RJ45version=0 <*
Siemens · SCALANCE W1788-2 M12version=0 <*
Siemens · SCALANCE W786-2 SFPversion=0 <*
Siemens · SCALANCE SC636-2Cversion=0 <V2.3; version=V2.3 <V3.0
Siemens · SCALANCE XR524-8C, 2x230V (L3 int.)version=0 <V6.6
Siemens · SCALANCE WAB762-1version=0 <V3.0.0
Siemens · SCALANCE M876-4version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE W748-1 M12version=0 <*
Siemens · SCALANCE XP216POE EECversion=0 <V4.4
Siemens · SCALANCE XF204-2BA DNAversion=0 <V4.4
Siemens · SCALANCE XC206-2SFP EECversion=0 <V4.4
Siemens · SCALANCE WAM766-1 (ME)version=0 <V3.0.0
Siemens · SCALANCE XP216EECversion=0 <V4.4
Siemens · SCALANCE W738-1 M12version=0 <*
Siemens · SCALANCE XR328-4C WG (24XFE, 4XGE, 24V)version=0 <V4.4
Siemens · SCALANCE M876-4 (NAM)version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE XM408-8Cversion=0 <V6.6
Siemens · SCALANCE MUM853-1 (EU)version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE WAM763-1 (US)version=0 <V3.0.0
Siemens · SCALANCE W788-1 M12version=0 <*
Siemens · SCALANCE XC206-2G PoEversion=0 <V4.4
Siemens · SCALANCE W786-1 RJ45version=0 <*
Siemens · SCALANCE XB208 (PN)version=0 <V4.4
Siemens · SCALANCE XR528-6M (2HR2, L3 int.)version=0 <V6.6
Siemens · SCALANCE W734-1 RJ45 (USA)version=0 <*
Siemens · SCALANCE XB213-3 (SC, E/IP)version=0 <V4.4
Siemens · SCALANCE XB216 (E/IP)version=0 <V4.4
Siemens · SCALANCE XC208G PoE (54 V DC)version=0 <V4.4
Siemens · SCALANCE W1788-2 EEC M12version=0 <*
Siemens · SCALANCE XB205-3LD (SC, PN)version=0 <V4.4
Siemens · SCALANCE XM408-4Cversion=0 <V6.6
Siemens · SIPLUS NET SCALANCE XC206-2SFPversion=0 <V4.4
Siemens · SCALANCE WUM766-1 (USA)version=0 <V3.0.0
Siemens · SCALANCE XR524-8C, 24V (L3 int.)version=0 <V6.6
Siemens · SCALANCE XR552-12Mversion=0 <V6.6
Siemens · SCALANCE W1788-1 M12version=0 <*
Siemens · SCALANCE XB213-3 (ST, PN)version=0 <V4.4
Siemens · SCALANCE S615 LAN-Routerversion=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE W788-2 RJ45version=0 <*
Siemens · SCALANCE SC646-2Cversion=0 <V2.3; version=V2.3 <V3.0
Siemens · SCALANCE WUM763-1version=0 <V3.0.0
Siemens · SCALANCE M876-4 (EU)version=0 <V7.2; version=0 <V8.0
Siemens · SCALANCE WAM763-1 (ME)version=0 <V3.0.0
Siemens · SCALANCE XB213-3 (ST, E/IP)version=0 <V4.4
Siemens · SCALANCE XC216-3G PoE (54 V DC)version=0 <V4.4
Siemens · SCALANCE XC206-2G PoE EEC (54 V DC)version=0 <V4.4
Siemens · SCALANCE W778-1 M12version=0 <*
Siemens · SCALANCE M874-2version=0 <V7.2; version=0 <V8.0

Published CVSS scores

5.1Siemens ProductCERTCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
2.7Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1212Exploitation for Credential Access

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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