Cyber Resilience

CVE-2024-51139

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 0.0098 59th percentile
Risk Priority 79 floored blend · peak EPSS

Summary

CVE-2024-51139 is a critical-severity Classic Buffer Overflow (CWE-120) 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 41% 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-2024-51139 is a buffer overflow vulnerability (CWE-120) affecting the CGI parser in multiple Draytek Vigor router models, including 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, Vigor165/166 4.2.7 and earlier, Vigor2135/2765/2766 4.4.5.1 and earlier, Vigor2865/2866/2927 4.4.5.3 and earlier, Vigor2962/3910 4.3.2.8/4.4.3.1 and earlier, and Vigor3912 4.3.6.1 and earlier. The flaw resides in how the parser processes the Content-Length header of incoming HTTP POST requests and carries a CVSS 3.1 score of 9.8.

An unauthenticated remote attacker can send a crafted HTTP POST request over the network to trigger the overflow, resulting in arbitrary code execution with full control over the affected device. No user interaction or credentials are required, and the attack surface is exposed to any network-reachable interface accepting such requests.

Public references point to Draytek and an advisory detailing multiple router issues, but no specific mitigation steps or patch availability details are provided in the source data. The associated EPSS score remains flat at 0.0675 with no observed rise after disclosure.

EU & UK References

Vulnerability Data

Buffer Overflow vulnerability in Vigor2620/LTE200 3.9.8.9 and earlier and Vigor2860/2925 3.9.8 and earlier and Vigor2862/2926 3.9.9.5 and earlier and Vigor2133/2762/2832 3.9.9 and earlier and Vigor165/166 4.2.7 and earlier and Vigor2135/2765/2766 4.4.5.1 and earlier and Vigor2865/2866/2927 4.4.5.3 and earlier and Vigor2962/3910…

more

4.3.2.8/4.4.3.1 and earlier and Vigor3912 4.3.6.1 and earlier allows a remote attacker to execute arbitrary code via the CGI parser's handling of the "Content-Length" header of HTTP POST requests.

CWE(s)
CWE-120

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-2024-41596Same product: Draytek Vigor1000B
CVE-2024-41588Same product: Draytek Vigor1000B
CVE-2024-51138Same product: Draytek Vigor1000B
CVE-2024-41592Same product: Draytek Vigor1000B
CVE-2024-41590Same product: Draytek Vigor1000B
CVE-2024-41593Same product: Draytek Vigor1000B
CVE-2024-46582Same product: Draytek Vigor3910
CVE-2024-46580Same product: Draytek Vigor3910
CVE-2024-46590Same product: Draytek Vigor3910
CVE-2024-46581Same product: Draytek Vigor3910

Affected Assets

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
draytek
vigor2135 firmware
≤ 4.4.5.5
+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)

—

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

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and analysis can find missing size checks before deployment.

SI-10 Information Input Validation good match

Input validation directly enforces size checks before buffer copies.

SA-8 Security and Privacy Engineering Principles partial match

Engineering principles require bounds checking and safe buffer handling in design.

SI-16 Memory Protection partial match

Memory protection limits the impact of an overflow once it occurs.

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
finds

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