CVE-2021-27408

The affected product is vulnerable to an out-of-bounds read, which can cause information leakage leading to arbitrary code execution if chained to the out-of-bounds write vulnerability 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-2021-27408 is rated Moderate Risk (57.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.69%). EPSS rose +1.47% over the last day, indicating growing attacker interest. 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-2021-27408

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 2026-06-15 0.22% 1.69% +1.47%
2 2025-11-24 0.37% 0.22% -0.14%
3 2025-11-21 — 0.37% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27408

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N 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:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-27408

Affected software / configurations for CVE-2021-27408

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-2021-27408

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