Cyber Resilience

CVE-2024-51138

Memory Safety in Draytek Vigor2962 Firmware ≤ 4.3.2.9

Memory Safety
Published
27 February 2025
Modified
05 July 2026
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 0.010 61th percentile
Risk Priority 79 floored blend · peak EPSS

Summary

CVE-2024-51138 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Draytek Vigor2962 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 39% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2024-51138 is a stack-based buffer overflow vulnerability (CWE-121) in the URL parsing functionality of the TR069 STUN server present in multiple Draytek Vigor router models. Affected devices include Vigor165/166 running 4.2.7 and earlier, Vigor2620/LTE200 at 3.9.8.9 and earlier, Vigor2860/2925 at 3.9.8 and earlier, Vigor2862/2926 at 3.9.9.5 and earlier, and numerous additional models up through firmware versions such as 4.4.5.3, all of which perform insufficient bounds checking on the quantity of URL parameters.

A remote attacker can exploit the flaw by sending a single crafted request over the network without authentication or user interaction. Successful exploitation grants arbitrary code execution with elevated privileges, corresponding to the CVSS 9.8 rating that reflects full impact on confidentiality, integrity, and availability.

Public references point to Draytek product information and a technical advisory detailing multiple related issues in the same router family, though no specific patch versions or mitigation steps are enumerated in the available data. The associated EPSS score has remained flat at 0.0859 with no observed increase after disclosure.

EU & UK References

Vulnerability Data

Vigor165/166 4.2.7 and earlier; Vigor2620/LTE200 3.9.8.9 and earlier; Vigor2860/2925 3.9.8 and earlier; Vigor2862/2926 3.9.9.5 and earlier; Vigor2133/2762/2832 3.9.9 and earlier; Vigor2135/2765/2766 4.4.5. and earlier; Vigor2865/2866/2927 4.4.5.3 and earlier; Vigor2962 4.3.2.8 and earlier; Vigor3912 4.3.6.1 and earlier; Vigor3910 4.4.3.1 and earlier…

more

a stack-based buffer overflow vulnerability has been identified in the URL parsing functionality of the TR069 STUN server. This flaw occurs due to insufficient bounds checking on the amount of URL parameters, allowing an attacker to exploit the overflow by sending a maliciously crafted request. Consequently, a remote attacker can execute arbitrary code with elevated privileges.

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-41592Same product: Draytek Vigor1000B
CVE-2024-41590Same product: Draytek Vigor1000B
CVE-2024-51139Same product: Draytek Vigor1000B
CVE-2024-41596Same product: Draytek Vigor1000B
CVE-2024-41588Same product: Draytek Vigor1000B
CVE-2024-41593Same product: Draytek Vigor1000B
CVE-2024-41586Same product: Draytek Vigor3910
CVE-2024-41591Same product: Draytek Vigor1000B
CVE-2024-41587Same product: Draytek Vigor1000B
CVE-2024-41594Same product: Draytek Vigor1000B

Affected Assets

draytek
vigor3912 firmware
≤ 4.4.3.2
draytek
vigor2620 firmware
≤ 3.9.9.1
draytek
vigorlte200 firmware
≤ 3.9.9.1
draytek
vigor2860 firmware
≤ 3.9.8.3
draytek
vigor2925 firmware
≤ 3.9.8.3
draytek
vigor2862 firmware
≤ 3.9.9.8
draytek
vigor2926 firmware
≤ 3.9.9.8
draytek
vigor2133 firmware
≤ 3.9.9.2
draytek
vigor2762 firmware
≤ 3.9.9.2
draytek
vigor2832 firmware
≤ 3.9.9.2
+13 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)
  • 2 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and analysis can discover stack-buffer overflows before deployment.

SI-10 Information Input Validation good match

Input validation directly stops untrusted data from exceeding stack buffer bounds.

SI-16 Memory Protection good match

Memory-protection mechanisms limit the ability to execute injected code after a stack overflow.

SA-8 Security and Privacy Engineering Principles partial match

Secure-engineering principles include bounds-checked coding and safe buffer handling that avoid introducing the flaw.

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 prevent introduction of stack buffer overflows.

ID.RA-01 partial match
prevents

Vulnerability scanning can discover stack buffer overflows but does not prevent their introduction.

PR.PS-02 partial match
prevents

Patching eliminates known instances of the weakness after discovery.

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.8.29 Security testing in development and acceptance mostly match
finds

Security testing (fuzzing, static analysis) detects stack overflows before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates buffer-safety practices that directly prevent stack overflows.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify buffer-size and input-validation rules.

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

Secure architecture principles include memory-safety and least-privilege stack usage.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly forbid unsafe buffer handling that causes CWE-121.

A.8.32 Change management none match
none

Change-management gates can enforce security reviews that catch buffer issues.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (1 rule)
  • V-248594 OL 8 must implement address space layout randomization (ASLR) to protect its memory from unauthorized code execution. prevents CWE-121
Oracle Linux 9 (1 rule)
  • V-271452 OL 9 must use a Linux Security Module configured to enforce limits on system services. prevents CWE-121

References