HOMEVULNERABILITIESCVE-2019-12255
CRITICALPOC

CVE-2019-12255

CWE-120Published: August 9, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2019-12255 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

A proof-of-concept (PoC) exploit exists for CVE-2019-12255. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

belden33 product(s)
hirschmann hioshirschmann ees20hirschmann ees25hirschmann eesx20hirschmann eesx30hirschmann grs1020hirschmann grs1030hirschmann grs1042hirschmann grs1120hirschmann grs1130hirschmann grs1142hirschmann msp30+21
netapp1 product(s)
e-series santricity os controller
siemens14 product(s)
siprotec 5 firmwaresiprotec 5power meter 9410 firmwarepower meter 9410power meter 9810 firmwarepower meter 9810ruggedcom win7000 firmwareruggedcom win7000ruggedcom win7018 firmwareruggedcom win7018ruggedcom win7025 firmwareruggedcom win7025+2
sonicwall1 product(s)
sonicos
windriver1 product(s)
vxworks
Source: NVD CPE · 53 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/154022/VxWorks-6.8-Integer-Underflow.html
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-189842.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-352504.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-632562.pdf
ADVISORYhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0009
ADVISORYhttps://security.netapp.com/advisory/ntap-20190802-0001/
ADVISORYhttps://support.f5.com/csp/article/K41190253
ADVISORYhttps://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-12255
ADVISORYhttps://support2.windriver.com/index.php?page=security-notices
ADVISORYhttps://www.windriver.com/security/announcements/tcp-ip-network-stack-ipnet-urgent11/
ADVISORYhttp://packetstormsecurity.com/files/154022/VxWorks-6.8-Integer-Underflow.html
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-189842.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-352504.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-632562.pdf
ADVISORYhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0009
ADVISORYhttps://security.netapp.com/advisory/ntap-20190802-0001/
ADVISORYhttps://support.f5.com/csp/article/K41190253
ADVISORYhttps://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-12255
ADVISORYhttps://support2.windriver.com/index.php?page=security-notices
ADVISORYhttps://www.windriver.com/security/announcements/tcp-ip-network-stack-ipnet-urgent11/

All References (22)

→
http://packetstormsecurity.com/files/154022/VxWorks-6.8-Integer-Underflow.htmlExploit · Third Party Advisory · VDB Entry
→
https://cert-portal.siemens.com/productcert/pdf/ssa-189842.pdfThird Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-352504.pdfThird Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-632562.pdfThird Party Advisory
→
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0009Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20190802-0001/Third Party Advisory
→
https://support.f5.com/csp/article/K41190253Third Party Advisory
→
https://support.f5.com/csp/article/K41190253?utm_source=f5support&amp%3Butm_medium=RSS
→
https://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-12255Vendor Advisory
→
https://support2.windriver.com/index.php?page=security-noticesIssue Tracking · Vendor Advisory
→
https://www.windriver.com/security/announcements/tcp-ip-network-stack-ipnet-urgent11/Vendor Advisory
→
http://packetstormsecurity.com/files/154022/VxWorks-6.8-Integer-Underflow.htmlExploit · Third Party Advisory · VDB Entry
→
https://cert-portal.siemens.com/productcert/pdf/ssa-189842.pdfThird Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-352504.pdfThird Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-632562.pdfThird Party Advisory

Quick Facts

CVE IDCVE-2019-12255
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-120
CISA KEVNo
ExploitPOC
Affected5 vendor(s)
PublishedAug 9, 2019

Related CVEs (CWE-120)

CVE-2023-4260
10.0
CVE-2021-33975
10.0
CVE-2021-33972
10.0
CVE-2022-20827
10.0
CVE-2015-5093
10.0
CVE-2011-4862
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-12255 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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