2021-28846 | TRENDnet TEW-755AP/TEW-755AP2KAC/TEW-821DAP2KAC/TEW-825DAP POST Request apply_cgi fprintf format string

CVSS Meta Temp Score

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Current Exploit Price (≈)

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CTI Interest Score

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4.2 $0-$5k 0.57

A vulnerability was found in TRENDnet TEW-755AP, TEW-755AP2KAC, TEW-821DAP2KAC and TEW-825DAP 1.11B03. It has been classified as critical. This affects the function fprintf of the file apply_cgi of the component POST Request Handler. The manipulation with an unknown input leads to a format string vulnerability. CWE is classifying the issue as CWE-134. This is going to have an impact on availability. The summary by CVE is:

A Format String vulnerablity exists in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03, which could let a remote malicious user cause a denial of service due to a logic bug at address 0x40dcd0 when calling fprintf with “%s: key len = %d, too longn” format. The two variables seem to be put in the wrong order. The vulnerability could be triggered by sending the POST request to apply_cgi with a long and unknown key in the request body.

The weakness was disclosed 08/11/2021. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2021-28846 since 03/19/2021. The exploitability is told to be easy. It is possible to initiate the attack remotely. The successful exploitation requires a authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2021).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.



VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

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Vector Complexity Authentication Confidentiality Integrity Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Format String
CWE: CWE-134
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

03/19/2021 CVE assigned
08/11/2021 +144 days Advisory disclosed
08/11/2021 +0 days VulDB entry created
08/15/2021 +4 days VulDB last updateAdvisory: github.com
Status: Not defined

CVE: CVE-2021-28846 (🔒)

Created: 08/11/2021 12:23
Updated: 08/15/2021 15:02
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍


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