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PatchSiren cyber security CVE debrief

CVE-2022-40799 D-Link CVE debrief

CVE-2022-40799 is a D-Link DNR-322L vulnerability that CISA has placed in the Known Exploited Vulnerabilities catalog. For defenders, the main takeaway is operational: treat any exposed DNR-322L deployment as urgent to assess, mitigate, or retire. The source corpus does not provide a CVSS score or detailed exploit mechanics, so the safest response is to follow vendor guidance, apply any available mitigations, and replace or discontinue the product if mitigation is not available.

Vendor
D-Link
Product
DNR-322L
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-08-05
Original CVE updated
2025-08-05
Advisory published
2025-08-05
Advisory updated
2025-08-05

Who should care

Organizations that operate or support D-Link DNR-322L devices, especially security teams, network administrators, and asset owners responsible for internet-facing or otherwise reachable appliances.

Technical summary

The official records identify the issue as a "Download of Code Without Integrity Check" vulnerability affecting the D-Link DNR-322L. CISA has marked it as known exploited. The supplied corpus does not include additional technical detail, a CVSS score, or confirmed attack prerequisites, so the only supported conclusion is that the product should be treated as high priority for defensive review and remediation.

Defensive priority

High. KEV inclusion means this vulnerability is already considered actively exploited by CISA, and the listed due date indicates remediation should be completed promptly.

Recommended defensive actions

  • Inventory all D-Link DNR-322L devices and determine whether any are exposed to untrusted networks.
  • Apply vendor instructions and mitigations as provided by D-Link.
  • If no effective mitigation exists, discontinue use of the product and plan replacement.
  • Follow CISA guidance, including BOD 22-01 where applicable to your environment.
  • Prioritize remediation before the KEV due date of 2025-08-26.
  • Confirm there are no external management interfaces or unnecessary services exposed on affected devices.

Evidence notes

This debrief is intentionally limited to the supplied corpus and official links. Supported facts: the issue is CVE-2022-40799; the product is D-Link DNR-322L; CISA lists it in the Known Exploited Vulnerabilities catalog; the KEV date added is 2025-08-05 and the due date is 2025-08-26; CISA recommends applying vendor mitigations, following BOD 22-01 guidance where relevant, or discontinuing use if mitigations are unavailable. No additional exploitation details or severity score were supplied.

Sources and references

Verified primary and authoritative sources

  • CVE-2022-40799 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2022-40799

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2022-40799 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2022-40799

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.