Siemens SIMATIC HMI Comfort Outdoor Panels up to 16 Update 3 out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Siemens SIMATIC HMI Comfort Outdoor Panels, SIMATIC HMI Comfort Panels, SIMATIC HMI KTP Mobile Panels and SIMATIC Wincc Runtime Advanced up to 16 Update 3. This vulnerability affects unknown code. Such manipulation leads to out-of-bounds write. This vulnerability is referenced as CVE-2021-25661. No exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Siemens SIMATIC HMI Comfort Outdoor Panels, SIMATIC HMI Comfort Panels, SIMATIC HMI KTP Mobile Panels and SIMATIC Wincc Runtime Advanced up to 16 Update 3 (SCADA Software). Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4). SmartVNC has an out-of-bounds memory access vulnerability that could be triggered on the client side when sending data from the server, which could result in a Denial-of-Service condition.

The weakness was published 05/12/2021 as ssa-538778. The advisory is shared for download at cert-portal.siemens.com. This vulnerability is handled as CVE-2021-25661. There are neither technical details nor an exploit publicly available.

Applying the patch 16 Update 4 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 16 Update 4

Timelineinfo

01/21/2021 🔍
05/12/2021 +110 days 🔍
05/12/2021 +0 days 🔍
06/03/2026 +1848 days 🔍

Sourcesinfo

Vendor: siemens.com

Advisory: ssa-538778
Status: Confirmed

CVE: CVE-2021-25661 (🔍)
GCVE (CVE): GCVE-0-2021-25661
GCVE (VulDB): GCVE-100-174980

Entryinfo

Created: 05/12/2021 22:35
Updated: 06/03/2026 03:26
Changes: 05/12/2021 22:35 (39), 05/15/2021 16:02 (5), 06/03/2026 03:26 (43)
Complete: 🔍
Cache ID: 216::103

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