CVE-2021-27410

The affected product is vulnerable to an out-of-bounds write, which may result in corruption of data or code execution on the Welch Allyn medical device management tools (Welch Allyn Service Tool: versions prior to v1.10, Welch Allyn Connex Device Integration Suite – Network Connectivity Engine (NCE): versions prior to v5.3, Welch Allyn Software Development Kit (SDK): versions prior to v3.2, Welch Allyn Connex Central Station (CS): versions prior to v1.8.6, Welch Allyn Service Monitor: versions prior to v1.7.0.0, Welch Allyn Connex Vital Signs Monitor (CVSM): versions prior to v2.43.02, Welch Allyn Connex Integrated Wall System (CIWS): versions prior to v2.43.02, Welch Allyn Connex Spot Monitor (CSM): versions prior to v1.52, Welch Allyn Spot Vital Signs 4400 Device (Spot 4400) / Welch Allyn Spot 4400 Vital Signs Extended Care Device: versions prior to v1.11.00).

Published: 2021-06-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-27410 is rated Moderate Risk (58.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.34%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-27410

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-04 0.55% 0.34% -0.21%
2 2025-11-24 0.24% 0.55% +0.31%
3 2025-11-21 — 0.24% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27410

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-27410

Affected software / configurations for CVE-2021-27410

Vendor Product Version Raw CPE
hillrom connex_central_station < 1.8.6 cpe:2.3:a:hillrom:connex_central_station:*:*:*:*:*:*:*:*
hillrom connex_device_integration_suite_network_connectivity_engine < 5.3 cpe:2.3:a:hillrom:connex_device_integration_suite_network_connectivity_engine:*:*:*:*:*:*:*:*
hillrom connex_integrated_wall_system < 2.43.02 cpe:2.3:a:hillrom:connex_integrated_wall_system:*:*:*:*:*:*:*:*
hillrom connex_spot_monitor < 1.52 cpe:2.3:a:hillrom:connex_spot_monitor:*:*:*:*:*:*:*:*
hillrom connex_vital_signs_monitor < 2.43.02 cpe:2.3:a:hillrom:connex_vital_signs_monitor:*:*:*:*:*:*:*:*
hillrom service_monitor < 1.7.0.0 cpe:2.3:a:hillrom:service_monitor:*:*:*:*:*:*:*:*
hillrom service_tool < 1.10 cpe:2.3:a:hillrom:service_tool:*:*:*:*:*:*:*:*
hillrom software_development_kit < 3.2 cpe:2.3:a:hillrom:software_development_kit:*:*:*:*:*:*:*:*
hillrom spot_vital_signs_4400 < 1.11.00 cpe:2.3:a:hillrom:spot_vital_signs_4400:*:*:*:*:-:*:*:*
hillrom spot_vital_signs_4400 < 1.11.00 cpe:2.3:a:hillrom:spot_vital_signs_4400:*:*:*:*:extended_care:*:*:*

References for CVE-2021-27410

URL Tags
https://us-cert.cisa.gov/ics/advisories/icsma-21-152-01 Mitigation Third Party Advisory US Government Resource
cvelogic Threat Intelligence