What is the CVSS score of CVE-2020-28877?

CVE-2020-28877 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.2%.

Is there a public PoC exploit available for CVE-2020-28877?

Yes, a public proof-of-concept exploit is available for CVE-2020-28877. Prioritise patching immediately. EPSS: 1.2%.

Wdr7400 Firmware CVE-2020-28877

CRITICAL

Classic Buffer Overflow (CWE-120)

2020-11-20 cve@mitre.org

Buffer Overflow TP-Link Wdr7400 Firmware Wdr7500 Firmware Wdr7660 Firmware Wdr7800 Firmware Wdr8400 Firmware Wdr8500 Firmware Wdr8600 Firmware Wdr8620 Firmware Wdr8640 Firmware Wdr8660 Firmware Wr880N Firmware Wr886N Firmware Wr890N Firmware Wr882N Firmware Wr708N Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Nov 20, 2020 - 16:15 nvd

CRITICAL 9.8

DescriptionNVD

Buffer overflow in in the copy_msg_element function for the devDiscoverHandle server in the TP-Link WR and WDR series, including WDR7400, WDR7500, WDR7660, WDR7800, WDR8400, WDR8500, WDR8600, WDR8620, WDR8640, WDR8660, WR880N, WR886N, WR890N, WR890N, WR882N, and WR708N.

AnalysisAI

Buffer overflow in in the copy_msg_element function for the devDiscoverHandle server in the TP-Link WR and WDR series, including WDR7400, WDR7500, WDR7660, WDR7800, WDR8400, WDR8500, WDR8600,. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. Buffer overflow in in the copy_msg_element function for the devDiscoverHandle server in the TP-Link WR and WDR series, including WDR7400, WDR7500, WDR7660, WDR7800, WDR8400, WDR8500, WDR8600, WDR8620, WDR8640, WDR8660, WR880N, WR886N, WR890N, WR890N, WR882N, and WR708N. Affected products include: Tp-Link Wdr7400 Firmware, Tp-Link Wdr7500 Firmware, Tp-Link Wdr7660 Firmware, Tp-Link Wdr7800 Firmware, Tp-Link Wdr8400 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.