How severe is CVE-2019-12256?

CVE-2019-12256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-12256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 27% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12256?

CVE-2019-12256 primarily affects Windriver Vxworks. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-12256?

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

When was CVE-2019-12256 published?

CVE-2019-12256 was published on 2019-08-09 and last updated on 2026-06-17.

CVE-2019-12256

CVE-2019-12256 is a critical-severity vulnerability in Windriver Vxworks with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 27% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 27% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Windriver Vxworks
Published: 2019-08-09
Last modified: 2026-06-17

Description

Wind River VxWorks 6.9 and vx7 has a Buffer Overflow in the IPv4 component. There is an IPNET security vulnerability: Stack overflow in the parsing of IPv4 packets’ IP options.

Frequently asked questions

What is CVE-2019-12256?: Wind River VxWorks 6.9 and vx7 has a Buffer Overflow in the IPv4 component. There is an IPNET security vulnerability: Stack overflow in the parsing of IPv4 packets’ IP options.
How severe is CVE-2019-12256?: CVE-2019-12256 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-12256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 27% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12256?: CVE-2019-12256 primarily affects Windriver Vxworks. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-12256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-12256 published?: CVE-2019-12256 was published on 2019-08-09 and last updated on 2026-06-17.

References

Affected products (16)

cpe:2.3:o:windriver:vxworks:*:*:*:*:*:*:*:*
cpe:2.3:o:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sonicos:6.2.7.0:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sonicos:6.2.7.1:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sonicos:6.2.7.7:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_5_firmware:*:*:*:*:*:*:*:cp200
cpe:2.3:o:siemens:siprotec_5_firmware:*:*:*:*:*:*:*:cp300
cpe:2.3:o:siemens:power_meter_9410_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:power_meter_9810_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_win7000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_win7018_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_win7025_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_win7200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:belden:hirschmann_hios:*:*:*:*:*:*:*:*
cpe:2.3:o:belden:garrettcom_magnum_dx940e_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Windriver Vxworks

CVE-2013-0714 — Critical (CVSS 10.0): IPSSH (aka the SSH server) in Wind River VxWorks 6.5 through 6.9 allows remote attackers to execute arbitrary code or…
CVE-2020-35198 — Critical (CVSS 9.8): An issue was discovered in Wind River VxWorks 7. The memory allocator has a possible integer overflow in calculating a…
CVE-2021-29999 — Critical (CVSS 9.8): An issue was discovered in Wind River VxWorks through 6.8. There is a possible stack overflow in dhcp server.
CVE-2021-29998 — Critical (CVSS 9.8): An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.
CVE-2016-20009 — Critical (CVSS 9.8): A DNS client stack-based buffer overflow in ipdnsc_decode_name() affects Wind River VxWorks 6.5 through 7. NOTE: This…
CVE-2019-12262 — Critical (CVSS 9.8): Wind River VxWorks 6.6, 6.7, 6.8, 6.9 and 7 has Incorrect Access Control in the RARP client component. IPNET security…

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