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CVE-2021-28838

HIGH
7.5
CVSS Score
Published: August 10, 2021 at 05:23 PM UTC
Updated: June 17, 2026 at 03:46 AM UTC
18 products affected across 1 vendorDap 2695 FirmwareDap 2660 FirmwareDap 2553 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

Null pointer dereference vulnerability in D-Link DAP-2310 2,10RC039, DAP-2330 1.10RC036 BETA, DAP-2360 2.10RC055, DAP-2553 3.10rc039 BETA, DAP-2660 1.15rc131b, DAP-2690 3.20RC115 BETA, DAP-2695 1.20RC093, DAP-3320 1.05RC027 BETA and DAP-3662 1.05rc069 in the sbin/httpd binary. The crash happens at the `atoi' operation when a specific network package are sent to the httpd binary.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dap 2310 Firmware· D-Link
95%
v ≤ 2.10rc039
dlink-dap-2310 (same device)
Dap 2330 Firmware· D-Link
95%
v < 1.10rc0361.10rc036 beta
Affected range stops below 1.10rc036, so it looks safe — our inference, not a vendor statement
dlink-dap-2330 (same device)
Dap 2360 Firmware· D-Link
95%
v ≤ 2.10rc055
dlink-dap-2360 (same device)
Dap 2553 Firmware· D-Link
95%
v < 3.10rc0393.10rc039 beta
Affected range stops below 3.10rc039, so it looks safe — our inference, not a vendor statement
dlink-dap-2553 (same device)
Dap 2660 Firmware· D-Link
95%
v ≤ 1.15rc131b
dlink-dap-2660 (same device)
Dap 2690 Firmware· D-Link
95%
v < 3.20rc1153.20rc115 beta
Affected range stops below 3.20rc115, so it looks safe — our inference, not a vendor statement
dlink-dap-2690 (same device)
Dap 2695 Firmware· D-Link
95%
v ≤ 1.20rc093
dlink-dap-2695 (same device)
Dap 3320 Firmware· D-Link
95%
v < 1.05rc0271.05rc27 beta
Affected range stops below 1.05rc027, so it looks safe — our inference, not a vendor statement
dlink-dap-3320 (same device)
Dap 3662 Firmware· D-Link
95%
v < 1.05rc0691.05rc69 beta
Affected range stops below 1.05rc069, so it looks safe — our inference, not a vendor statement
dlink-dap-3662 (same device)
DAP-2310· D-Linkdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.dlink.com/en/security-bulletin/

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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