CVE-2019-12255
highpriority · attend · 75stack campaign · URGENT/11EPSS 0.752 · 100 %ileexploit · PoCDEEURUUSEPSS · scored 2026-10-27
Wind River VxWorks has a Buffer Overflow in the TCP component (issue 1 of 4). This is a IPNET security vulnerability: TCP Urgent Pointer = 0 that leads to an integer underflow.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedSIPROTEC 4 7SJ66siemens_psirt
Update to V4.41 or later version
https://support.industry.siemens.com/cs/ww/en/view/109743555/ - FixedAdvanced Networking Technology (ANT)cisa_csaf_ot
Wind River has produced controls and patches to mitigate the reported vulnerabilities. To obtain patches, email PSIRT@windriver.com and indicate the VxWorks major version for which you need source patches.
- FixedVxWorkscisa_csaf_ot
Wind River has produced controls and patches to mitigate the reported vulnerabilities. To obtain patches, email PSIRT@windriver.com and indicate the VxWorks major version for which you need source patches.
- FixedVxWorks 653cisa_csaf_ot
Wind River has produced controls and patches to mitigate the reported vulnerabilities. To obtain patches, email PSIRT@windriver.com and indicate the VxWorks major version for which you need source patches.
- FixedVxWorks End-of-Lifecisa_csaf_ot
Wind River has produced controls and patches to mitigate the reported vulnerabilities. To obtain patches, email PSIRT@windriver.com and indicate the VxWorks major version for which you need source patches.
- FixedVxWorks Vx7cisa_csaf_ot
Wind River has produced controls and patches to mitigate the reported vulnerabilities. To obtain patches, email PSIRT@windriver.com and indicate the VxWorks major version for which you need source patches.
- FixedSIPROTEC 4 7SJ66cisa_csaf_ot
Update to V4.41 or later version
https://support.industry.siemens.com/cs/ww/en/view/109743555/ - FixedAdvanced Networking Technology (ANT)cisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - FixedINTEGRITY RTOScisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - FixedIpnet TCP/IP Stackcisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - FixedOSEcisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - FixedVxWorkscisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - FixedVxWorks bootrom network stackcisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - FixedVxWorks under CURRENT support (6.9.4.11, Vx7 SR540, Vx7 SR610)cisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
https://www.spacelabshealthcare.com/products/security/security-advisories-and-archives/urgent-11-vulnerability-in-vxworks-ipnet-service/ - Mitigationphoenix_contact_psirt
Users are strongly recommended to install a firewall between the FL Switch GHS device and other parts of the network where an attacker may reside. The firewall needs to be configured in a way that either TCP packets with urgent flag are dropped or that the corresponding TCP connection the packet belongs to is terminated. It needs to be noticed that the urgent flag is a very rarely used feature. Thus, implementing the described firewall rule will most likely not harm usual network operation. Phoenix Contact recommends operating network-capable devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices.
https://www.phoenixcontact.com/assets/downloads_ed/local_pc/web_dwl_technical_info/ah_en_industrial_security_107913_en_01.pdf - MitigationAdvanced Networking Technology (ANT)cisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationVxWorkscisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationVxWorks 653cisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationVxWorks End-of-Lifecisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationVxWorks Vx7cisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationINTEGRITY RTOScisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationInterpeak IPnet TCP/IP Stackcisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationOSEcisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationVxWorks bootrom network stackcisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
- MitigationVxWorks under CURRENT support (6.9.4.11, Vx7 SR540, Vx7 SR610)cisa_csaf_ot
Additional vendors affected by the reported vulnerabilities have also released security advisories related to their affected products. Those advisories are as follows:
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (2)
Public proof-of-concept and weaponised exploit code.
affected products (96)
Products and version ranges known to be affected.
advisories (7)
Vendor and ecosystem advisories describing this.
- SSA-617233SSA-617233: Urgent/11 TCP/IP Stack Vulnerabilities in SIPROTEC 4 7SJ66 Devices2023-11-14csaf · siemens_psirtDE
SIPROTEC 4 7SJ66 devices are affected by multiple security vulnerabilities due to the underlying Wind River VxWorks network stack. This stack is affected by nine of the eleven vulnerabilities that are also known as "URGENT/11". The vulnerabilities could allow an attacker to execute a variety of exploits for the purpose of denial of service (DoS), data extraction, remote code execution, etc. targeting availability, integrity and confidentiality of the devices and data. Siemens has released a new version for SIPROTEC 4 7SJ66 and recommends to update to the latest version.
- VDE-2020-002PHOENIX CONTACT: Advisory for multiple FL Switch GHS utilising VxWorks2020-02-25csaf · phoenix_contact_psirtDE
CVS-2019-12255 Wind River VxWorks has a Buffer Overflow in the TCP component (issue 1 of 4). This is an IPNET security vulnerability: TCP Urgent Pointer = 0 that leads to an integer underflow. The vulnerability affects a little-known feature of the TCP/IP protocol, sending out-of-band data, also known as urgent data. Although the feature is rarely used in the real world, its implementation, consisting of an 'Urgent Flag' and an 'Urgent Pointer', is present in the header of every TCP packet. Exploiting these vulnerabilities does therefore not depend on any specific configuration. If a VxWorks device communicates using the TCP protocol, it is vulnerable. It also does not matter which side initiates a TCP connection. An attacker can exploit the vulnerabilities if the VxWorks device is operated as a server that accepts TCP connections, if the VxWorks device connects to a malicious host operated by the attacker, or as a man-in-the-middle, manipulating a TCP connection between the VxWorks device and a legitimate host. CVE-2019-12258 This vulnerability affects established TCP sessions. An attacker who can figure out the source and destination TCP port and IP addresses of a session can inject invalid TCP segments into the flow, causing the TCP session to be reset.
- WID-SEC-W-2023-2884Wind River VxWorks: Mehrere SchwachstellenDeutsch2019-07-29csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Wind River VxWorks ausnutzen, um dadurch die Integrität, Vertraulichkeit und Verfügbarkeit zu gefährden.
- ICSA-19-211-01Wind River VxWorks (Update A)2019-07-30icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could allow remote code execution.
- ICSA-19-274-01Interpeak IPnet TCP/IP Stack (Update E)2019-10-01icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could allow remote code execution.
- ICSA-23-320-10Siemens SIPROTEC 4 7SJ662023-11-14icsa · cisa_csaf_otUS
SIPROTEC 4 7SJ66 devices are affected by multiple security vulnerabilities due to the underlying Wind River VxWorks network stack. This stack is affected by nine of the eleven vulnerabilities that are also known as "URGENT/11". The vulnerabilities could allow an attacker to execute a variety of exploits for the purpose of denial of service (DoS), data extraction, remote code execution, etc. targeting availability, integrity and confidentiality of the devices and data. Siemens has released a new version for SIPROTEC 4 7SJ66 and recommends to update to the latest version.
- ICSMA-19-274-01Interpeak IPnet TCP/IP Stack (Update D)2019-10-01icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could allow remote code execution.
also known as (5)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (43)
External citations — patches, advisories, analysis.
- https://cert-portal.siemens.com/productcert/pdf/ssa-189842.pdfcnnvd
- https://cert-portal.siemens.com/productcert/pdf/ssa-352504.pdfcnnvd
- https://cert-portal.siemens.com/productcert/pdf/ssa-632562.pdfcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2019-12255cnnvd
- https://packetstormsecurity.com/files/154022/VxWorks-6.8-Integer-Underflow.htmlcnnvd
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0009cnnvd
- https://security.netapp.com/advisory/ntap-20190802-0001/cnnvd
- https://support.f5.com/csp/article/K41190253cnnvd
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