CVE-2021-28143

Exp

/jsonrpc on D-Link DIR-841 3.03 and 3.04 devices allows authenticated command injection via ping, ping6, or traceroute (under System Tools).

Published: 2021-03-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-28143 is rated High Exploit Risk (86.3/100): CVSS High severity, with high exploitation likelihood (EPSS 31.96%, 98th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +7.24% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-28143

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-28143

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 24.72% 31.96% +7.24%
2 2026-05-29 23.13% 24.72% +1.59%
3 2025-11-21 — 23.13% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-28143

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.0 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.1 5.9 [email protected]
7.7 2.0 HIGH
AV:A/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 5.1 10.0 [email protected]

Weakness enumeration for CVE-2021-28143

Affected software / configurations for CVE-2021-28143

Vendor Product Version Raw CPE
dlink dir-841_firmware 3.03 cpe:2.3:o:dlink:dir-841_firmware:3.03:*:*:*:*:*:*:*
dlink dir-841_firmware 3.04 cpe:2.3:o:dlink:dir-841_firmware:3.04:*:*:*:*:*:*:*

References for CVE-2021-28143

cvelogic Threat Intelligence