CVE-2019-13921

A vulnerability has been identified in SIMATIC WinAC RTX (F) 2010 (All versions < SP3 Update 1). Affected versions of the software contain a vulnerability that could allow an unauthenticated attacker to trigger a denial-of-service condition. The vulnerability can be triggered if a large HTTP request is sent to the executing service. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the service provided by the software.

Published: 2019-10-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-13921 is rated Moderate Risk (54.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.37%). 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-2019-13921

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 0.44% 1.37% +0.93%
2 2025-03-30 0.68% 0.44% -0.24%
3 2025-03-29 — 0.68% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-13921

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:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-13921

Affected software / configurations for CVE-2019-13921

Vendor Product Version Raw CPE
siemens simatic_winac_rtx_\(f\)_2010 — cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:*:*:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 — cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:*:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 — cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:update_1:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 — cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:update_2:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 — cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:update_3:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 sp1 cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp1:*:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 sp2 cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:-:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 sp2 cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_1:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 sp2 cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_2:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 sp2 cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_3:*:*:*:*:*:*
siemens simatic_winac_rtx_\(f\)_2010 sp2 cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_4:*:*:*:*:*:*

References for CVE-2019-13921

cvelogic Threat Intelligence