CVE-2021-28840

mediumpriority · track · 31EPSS 0.023 · 83 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.31% (83rd) EPSS

CVSS 5 · medium

Is it mine?

10 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

Null Pointer Dereference vulnerability exists in D-Link DAP-2310 2.07.RC031, DAP-2330 1.07.RC028, DAP-2360 2.07.RC043, DAP-2553 3.06.RC027, DAP-2660 1.13.RC074, DAP-2690 3.16.RC100, DAP-2695 1.17.RC063, DAP-3320 1.01.RC014 and DAP-3662 1.01.RC022 in the upload_config function of sbin/httpd binary. When the binary handle the specific HTTP GET request, the content in upload_file variable is NULL in the upload_config function then the strncasecmp would take NULL as first argument, and incur the NULL pointer dereference vulnerability.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-476USprimary

affected products (10)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
dlink dap-2310 firmware= 2.0.7.rc031nvdUScpe:2.3:o:dlink:dap-2310_firmware:*:*:*:*:*:*:*:*
dlink dap-2330 firmware= 1.07.rc028nvdUScpe:2.3:o:dlink:dap-2330_firmware:*:*:*:*:*:*:*:*
dlink dap-2360 firmware= 2.07.rc043nvdUScpe:2.3:o:dlink:dap-2360_firmware:*:*:*:*:*:*:*:*
dlink dap-2553 firmware= 3.06.rc027nvdUScpe:2.3:o:dlink:dap-2553_firmware:*:*:*:*:*:*:*:*
dlink dap-2660 firmware= 1.13.rc074nvdUScpe:2.3:o:dlink:dap-2660_firmware:*:*:*:*:*:*:*:*
dlink dap-2690 firmware= 3.16.rc100nvdUScpe:2.3:o:dlink:dap-2690_firmware:*:*:*:*:*:*:*:*
dlink dap-2695 firmware= 1.17.rc063nvdUScpe:2.3:o:dlink:dap-2695_firmware:*:*:*:*:*:*:*:*
dlink dap-3320 firmware= 1.01.rc014nvdUScpe:2.3:o:dlink:dap-3320_firmware:*:*:*:*:*:*:*:*
dlink dap-3662 firmware= 1.01.rc022nvdUScpe:2.3:o:dlink:dap-3662_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-08-10modified 2026-06-17

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+8817 more

references (10)

External citations — patches, advisories, analysis.

scry

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