Tew 755Ap Firmware CVE-2021-28844

HIGH

NULL Pointer Dereference (CWE-476)

2021-08-10 cve@mitre.org

Denial Of Service Null Pointer Dereference Tew 755Ap Firmware Tew 755Ap2Kac Firmware Tew 821Dap2Kac Firmware Tew 825Dap Firmware Trendnet

7.5

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-476 OWASP Top 10:2025 A10:2025 - Mishandling of Exceptional Conditions ASVS 5.0 V16 - Security Logging and Error Handling Null pointer safety, defensive checks MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could crash the application by dereferencing a null pointer by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 1.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

AnalysisAI

Null Pointer Dereference vulnerability exists in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03 by sending the POST request to apply_cgi via a. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check

Technical ContextAI · show details

This vulnerability is classified as NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. Null Pointer Dereference vulnerability exists in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03 by sending the POST request to apply_cgi via a do_graph_auth action without a session_id key. Affected products include: Trendnet Tew-755Ap Firmware, Trendnet Tew-755Ap2Kac Firmware, Trendnet Tew-821Dap2Kac Firmware, Trendnet Tew-825Dap Firmware.

Know when Tew 755Ap Firmware gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

Null Pointer Dereference vulnerability exists in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03 by sending the POST request to apply_cgi via a do_graph_auth action without a session_id key.

Threat Intelligence Overview

EPSS Score

1.0%

Top 43% exploitable

Data Quality

3 sources

Confidence: Low

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 1.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

39

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:o:trendnet:tew-755ap_firmware:1.11b03:*:*:*:*:*:*:*

cpe:2.3:o:trendnet:tew-755ap2kac_firmware:1.11b03:*:*:*:*:*:*:*

cpe:2.3:o:trendnet:tew-821dap2kac_firmware:1.11b03:*:*:*:*:*:*:*

cpe:2.3:o:trendnet:tew-825dap_firmware:1.11b03:*:*:*:*:*:*:*

More in Tew 755Ap Firmware

View all

CVE-2022-46601 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the setbg_num parameter in the icp_setbg_img (s

CVE-2022-46600 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the wps_sta_enrollee_pin parameter in the actio

CVE-2022-46599 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the setlogo_num parameter in the icp_setlogo_im

CVE-2022-46598 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a command injection vulnerability via the wps_sta_enrollee_pin param

CVE-2022-46597 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a command injection vulnerability via the sys_service parameter in t

CVE-2022-46596 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the del_num parameter in the icp_delete_img (su

CVE-2022-46594 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the update_file_name parameter in the auto_up_f

CVE-2022-46593 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the wps_sta_enrollee_pin parameter in the do_st

CVE-2022-46592 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the wps_sta_enrollee_pin parameter in the set_s

CVE-2022-46591 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the reject_url parameter in the reject (sub_41B

CVE-2022-46590 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the cameo.cameo.netstat_rsname parameter in the

CVE-2022-46589 CRITICAL Act Now POC

TRENDnet TEW755AP 1.13B01 was discovered to contain a stack overflow via the cameo.cameo.netstat_option parameter in the

Same weakness CWE-476 – NULL Pointer Dereference

View all

CVE-2016-0742 HIGH

CVE-2014-3470 MEDIUM

CVE-2020-1967 HIGH POC

CVE-2017-3730 HIGH POC

CVE-2017-3169 CRITICAL POC

CVE-2016-4957 HIGH

CVE-2021-3449 MEDIUM

CVE-2015-3194 HIGH

Same technique Denial Of Service

View all

CVE-2015-5119 CRITICAL POC

CVE-2011-2462 CRITICAL POC

CVE-2011-0611 HIGH POC

CVE-2012-1889 HIGH POC

CVE-2012-0507 CRITICAL POC

CVE-2014-1761 HIGH POC

CVE-2015-5122 CRITICAL POC

CVE-2011-0609 HIGH POC

References

Advisories & patches

REF https://github.com/zyw-200/EQUAFL/blob/main/TRENDnet%20ticket.pdf

Search Externally

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy