CVE-2021-39509

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-77

Affected software

No affected versions have been published.

Timeline

Published
Aug 24, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-395109.8An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, The HTTP request parameter is used in the handler function CVE-2021-395146.5An issue was discovered in libjpeg through 2020021. An uncaught floating point exception in the function ACLosslessScan::ParseMCU() located CVE-2021-395156.5An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function SampleInterleavedLSScan::ParseMCU() loCVE-2021-395166.5An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function HuffmanDecoder::Get() located in huffmCVE-2021-395176.5An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::ReconstructUnsamCVE-2021-395186.5An issue was discovered in libjpeg through 2020021. LineBuffer::FetchRegion() in linebuffer.cpp has a heap-based buffer overflow.CVE-2021-395196.5An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PullQData() locaCVE-2021-395206.5An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PushReconstructeCVE-2021-395216.5An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function bit_read_BB() located in bits.c.CVE-2021-395228.8An issue was discovered in libredwg through v0.10.1.3751. bit_wcs2len() in bits.c has a heap-based buffer overflow.CVE-2021-395236.5An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function check_POLYLINE_handles() locatedCVE-2021-395258.8An issue was discovered in libredwg through v0.10.1.3751. bit_read_fixed() in bits.c has a heap-based buffer overflow.
CVE-2021-39509: Critical severity, CVSS 9.8 | Vulnix