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CVE-2026-6015· NVD / CVE Program· CNA VulDB

Tenda AC9 POST Request QuickIndex formQuickIndex stack-based overflow

A vulnerability has been found in Tenda AC9 15.03.02.13. Impacted is the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. Such manipulation of the argument PPPOEPassword leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

HighCVSS 7.4 · v4.0—No exploit No fix recorded
Published
Apr 10, 2026
Updated
Jun 17, 2026
EPSS
1.0% · 62th percentile
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Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

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
8.7
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:H/VI:H/VA:H/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.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
tendaac9 firmware
tendaac9

Affected versions

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

  • tenda ac9 firmware15.03.02.13

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.

  • Tenda AC9

    • 15.03.02.13affected

Same product

tenda: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-25434Tenda AC9 v15.03.2.21 was discovered to contain a stack overflow via the firewallen parameter in the SetFirewallCfg function.
    42Plan
  • CVE-2022-25414Tenda AC9 V15.03.2.21_cn was discovered to contain a stack overflow via the parameter NPTR.
    42Plan
  • CVE-2025-44877Tenda AC9 V15.03.06.42_multi was found to contain a command injection vulnerability in the formSetSambaConf function via the usbname paramet
    40Plan
  • CVE-2025-44872Tenda AC9 V15.03.06.42_multi was found to contain a command injection vulnerability in the formsetUsbUnload function via the deviceName para
    40Plan
  • CVE-2025-29384In Tenda AC9 v1.0 V15.03.05.14_multi, the wanMTU parameter of /goform/AdvSetMacMtuWan has a stack overflow vulnerability, which can lead to
    40Plan
  • CVE-2025-22949Tenda ac9 v1.0 firmware v15.03.05.19 is vulnerable to command injection in /goform/SetSambaCfg, which may lead to remote arbitrary code exec
    40Plan

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.

  • CVE-2025-10443207 days apartTenda AC9/AC15 exeCommand formexeCommand buffer overflow
    30Monitor
  • CVE-2026-60160 days apartTenda AC9 POST Request WizardHandle decodePwd stack-based overflow
    29Monitor
  • CVE-2026-219161 days apartTenda AC9 formGetDdosDefenceList stack-based overflow
    29Monitor
  • CVE-2026-219261 days apartTenda AC9 formGetRebootTimer stack-based overflow
    29Monitor
  • CVE-2025-5847306 days apartTenda AC9 HTTP POST Request SetRemoteWebCfg formSetSafeWanWebMan stack-based overflow
    29Monitor
  • CVE-2025-5839307 days apartTenda AC9 POST Request AdvSetLanip fromadvsetlanip buffer overflow
    29Monitor

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-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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

—

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