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 was 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. It has been rated as critical. This affects an unknown part. This manipulation causes out-of-bounds write. The identification of this vulnerability is CVE-2021-25660. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical was 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 vulnerability is an unknown function. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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 server side when sending data from the client, which could result in a Denial-of-Service condition.

The weakness was shared 05/12/2021 as ssa-538778. It is possible to read the advisory at cert-portal.siemens.com. This vulnerability is known as CVE-2021-25660. The technical details are unknown and an exploit is not publicly available.

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

Statistical analysis made it clear that VulDB provides the best quality 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-2021-25660 (🔍)
GCVE (CVE): GCVE-0-2021-25660
GCVE (VulDB): GCVE-100-174979

Entryinfo

Created: 05/12/2021 22:34
Updated: 06/03/2026 03:26
Changes: 05/12/2021 22:34 (39), 05/15/2021 15:55 (5), 06/03/2026 03:26 (43)
Complete: 🔍
Cache ID: 216::103

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