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CVE-2026-9531· NVD / CVE Program· CNA VulDB

Totolink CA750-PoE Setting cstecgi.cgi setUpgradeUboot os command injection

A weakness has been identified in Totolink CA750-PoE 6.2c.510. Impacted is the function setUpgradeUboot of the file /cgi-bin/cstecgi.cgi of the component Setting Handler. This manipulation of the argument FileName causes os command injection. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

LowCVSS 2.1 · v4.0—No exploit No fix recorded

Noroxi analysis

No Noroxi analysis for this record yet

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Published
May 26, 2026
Updated
Jul 23, 2026
EPSS
1.8% · 77th percentile
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Report tools

JSON

Action score

9

Monitor

Low priority for now.

CVSS
8 / 40 · 2.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.8%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

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.

Affected systems

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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.

  • Totolink CA750-PoE

    • 6.2c.510affected

Same product

totolink: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-9534Totolink CA750-PoE Setting cstecgi.cgi setWiFiWpsConfig os command injection
    9Monitor
  • CVE-2026-9533Totolink CA750-PoE Setting cstecgi.cgi recvUpgradeNewFw os command injection
    9Monitor
  • CVE-2026-9532Totolink CA750-PoE Setting cstecgi.cgi setUploadUserData os command injection
    9Monitor
  • CVE-2026-9515Totolink CA750-PoE Setting cstecgi.cgi setUnloadUserData os command injection
    9Monitor
  • CVE-2026-9514Totolink CA750-PoE Setting cstecgi.cgi setNetworkDiag os command injection
    9Monitor
  • CVE-2026-9513Totolink CA750-PoE Setting cstecgi.cgi NTPSyncWithHost os command injection
    9Monitor

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-9% in 7 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.

  • CVE-2026-95320 days apartTotolink CA750-PoE Setting cstecgi.cgi setUploadUserData os command injection
    9Monitor
  • CVE-2026-95330 days apartTotolink CA750-PoE Setting cstecgi.cgi recvUpgradeNewFw os command injection
    9Monitor
  • CVE-2026-95340 days apartTotolink CA750-PoE Setting cstecgi.cgi setWiFiWpsConfig os command injection
    9Monitor
  • CVE-2026-95111 days apartTotolink CA750-PoE Setting cstecgi.cgi setWebWlanIdx os command injection
    9Monitor
  • CVE-2026-95141 days apartTotolink CA750-PoE Setting cstecgi.cgi setNetworkDiag os command injection
    9Monitor
  • CVE-2026-95151 days apartTotolink CA750-PoE Setting cstecgi.cgi setUnloadUserData os command injection
    9Monitor

Chain candidates

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

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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-77 · Improper Neutralization of Special Elements used in a Command ('Command 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.

ATT&CK techniques

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Change log

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

References

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

All records