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CVE-2026-4196· NVD / CVE Program· CNA VulDB

D-Link DNS-1550-04 remote_backup.cgi cgi_set_rsync_server command injection

Noroxi assessment

Priority: Monitor (action score 10/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 5.9% (FIRST EPSS); higher than 93.2% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.
  • Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 2.1.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability has been found in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 and DNS-1550-04 up to 20260205. This impacts the function cgi_recovery/cgi_backup_now/cgi_set_schedule/cgi_set_rsync_server of the file /cgi-bin/remote_backup.cgi. The manipulation leads to command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.

LowCVSS 2.1 · v4.0—No exploit No fix recorded
Published
Mar 16, 2026
Updated
Jun 17, 2026
EPSS
5.9% · 93th percentile

Report tools

JSON

Action score

10

Monitor

Low priority for now.

CVSS
8 / 40 · 2.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.9%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
5.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-4196

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
dlinkdns-1550-04 firmware
dlinkdns-1550-04
dlinkdns-315l firmware
dlinkdns-315l
dlinkdns-320 firmware
dlinkdns-320
dlinkdns-320l firmware
dlinkdns-320l
dlinkdns-320lw firmware
dlinkdns-320lw
dlinkdns-321 firmware
dlinkdns-321

and 28 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • dlink dnr-202l firmwareup to 2026-02-05 inclusive
  • dlink dnr-326 firmwareup to 2026-02-05 inclusive
  • dlink dns-1100-4 firmwareup to 2026-02-05 inclusive
  • dlink dns-120 firmwareup to 2026-02-05 inclusive
  • dlink dns-1200-05 firmwareup to 2026-02-05 inclusive
  • dlink dns-1550-04 firmwareup to 2026-02-05 inclusive
  • dlink dns-315l firmwareup to 2026-02-05 inclusive
  • dlink dns-320 firmwareup to 2026-02-05 inclusive
  • dlink dns-320l firmwareup to 2026-02-05 inclusive
  • dlink dns-320lw firmwareup to 2026-02-05 inclusive
  • dlink dns-321 firmwareup to 2026-02-05 inclusive
  • dlink dns-322l firmwareup to 2026-02-05 inclusive
  • dlink dns-323 firmwareup to 2026-02-05 inclusive
  • dlink dns-325 firmwareup to 2026-02-05 inclusive
  • dlink dns-326 firmwareup to 2026-02-05 inclusive
  • dlink dns-327l firmwareup to 2026-02-05 inclusive
  • dlink dns-340l firmwareup to 2026-02-05 inclusive
  • dlink dns-343 firmwareup to 2026-02-05 inclusive
  • dlink dns-345 firmwareup to 2026-02-05 inclusive
  • dlink dns-726-4 firmwareup to 2026-02-05 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • D-Link DNR-202L

    • 20260205affected

  • D-Link DNR-322L

    • 20260205affected

  • D-Link DNR-326

    • 20260205affected

  • D-Link DNS-1100-4

    • 20260205affected

  • D-Link DNS-120

    • 20260205affected

  • D-Link DNS-1200-05

    • 20260205affected

  • D-Link DNS-1550-04

    • 20260205affected

  • D-Link DNS-315L

    • 20260205affected

  • D-Link DNS-320

    • 20260205affected

  • D-Link DNS-320L

    • 20260205affected

  • D-Link DNS-320LW

    • 20260205affected

  • D-Link DNS-321

    • 20260205affected

Same product

dlink: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-8132D-Link DNS-1550-04 HTTP POST Request webdav_mgr.cgi webdav_mgr command injection
    28Monitor
  • CVE-2024-8129D-Link DNS-1550-04 HTTP POST Request s3.cgi cgi_s3_modify command injection
    28Monitor
  • CVE-2024-8134D-Link DNS-1550-04 HTTP POST Request hd_config.cgi cgi_FMT_Std2R5_1st_DiskMGR command injection
    23Monitor
  • CVE-2024-8133D-Link DNS-1550-04 HTTP POST Request hd_config.cgi cgi_FMT_R5_SpareDsk_DiskMGR command injection
    23Monitor
  • CVE-2024-8131D-Link DNS-1550-04 HTTP POST Request apkg_mgr.cgi module_enable_disable command injection
    23Monitor
  • CVE-2024-8130D-Link DNS-1550-04 HTTP POST Request s3.cgi cgi_s3 command injection
    23Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records