How severe is CVE-2019-13921?

CVE-2019-13921 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-13921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-13921?

CVE-2019-13921 primarily affects Siemens Simatic Winac Rtx (f) 2010. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-13921?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-13921 published?

CVE-2019-13921 was published on 2019-10-10 and last updated on 2026-06-17.

CVE-2019-13921

CVE-2019-13921 is a high-severity vulnerability in Siemens Simatic Winac Rtx (f) 2010 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Siemens Simatic Winac Rtx (f) 2010
Published: 2019-10-10
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-13921?: CVE-2019-13921 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-13921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-13921?: CVE-2019-13921 primarily affects Siemens Simatic Winac Rtx (f) 2010. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-13921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-13921 published?: CVE-2019-13921 was published on 2019-10-10 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-878278.pdf

Affected products (11)

cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:update_1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:update_2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:-:update_3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp1:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_winac_rtx_\(f\)_2010:sp2:update_4:*:*:*:*:*:*

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