Cyber Resilience

CVE-2019-12255

Memory Safety in Sonicwall Sonicos 5.9.0.0 – 5.9.0.7

Public PoCHigh EPSSMemory Safety
Published
09 August 2019
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.75 99.5th percentile
Risk Priority 97 floored blend · peak EPSS

Summary

CVE-2019-12255 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Sonicwall Sonicos. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 0.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

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.

CWE(s)
CWE-120

Related Threats

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1190 Exploit Public-Facing Application Initial Accessconfidence: HIGH
Buffer overflow in the TCP stack of a network-exposed VxWorks device enables remote exploitation of a public-facing application.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalationconfidence: MEDIUM
Successful exploitation of the integer underflow may allow privilege escalation on the affected embedded system.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2019-12257Same product: Belden Garrettcom Magnum Dx940E
CVE-2020-8625Same product class: NAS / storage appliance
CVE-2025-0725Same product class: NAS / storage appliance
CVE-2024-52533Same product class: NAS / storage appliance
CVE-2021-3711Same product: Netapp E-Series Santricity Os Controller
CVE-2020-11984Same product class: NAS / storage appliance
CVE-2025-52864Same product class: NAS / storage appliance
CVE-2023-32968Same product class: NAS / storage appliance
CVE-2023-41292Same product class: NAS / storage appliance
CVE-2023-45041Same product class: NAS / storage appliance

Affected Assets

windriver
vxworks
6.5 — 6.9.4
netapp
e-series santricity os controller
8.00 — 8.40.50.00
sonicwall
sonicos
6.2.7.0, 6.2.7.1, 6.2.7.7 · 5.9.0.0 — 5.9.0.7 · 5.9.1.0. — 5.9.1.12 · 6.2.0.0 — 6.2.3.1
siemens
siprotec 5 firmware
all versions · ≤ 7.91
siemens
power meter 9410 firmware
≤ 2.2.1
siemens
power meter 9810 firmware
all versions
siemens
ruggedcom win7000 firmware
≤ bs5.2.461.17
siemens
ruggedcom win7018 firmware
≤ bs5.2.461.17
siemens
ruggedcom win7025 firmware
≤ bs5.2.461.17
siemens
ruggedcom win7200 firmware
≤ bs5.2.461.17
+2 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V5.2.1

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-120

Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure development practices directly enforce bounds checking and input validation that prevent classic buffer overflows.

ID.RA-01 partial match
prevents

Vulnerability identification processes such as code review or scanning detect classic buffer overflows before exploitation.

PR.PS-02 partial match
prevents

Routine patching replaces vulnerable code containing unchecked buffer copies with corrected versions.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
prevents

Secure coding directly requires bounds-checked memory operations, addressing the root cause of CWE-120.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development and acceptance can detect buffer overflows through fuzzing and static analysis, though it does not prevent them at the source.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates processes that can include input validation and bounds checking to prevent buffer overflows.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify input-size validation and safe buffer handling to mitigate classic buffer overflows.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture and engineering principles promote defensive coding patterns that reduce the likelihood of unchecked buffer copies.

References