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CVE-2026-5830· NVD / CVE Program· CNA VulDB

Tenda AC15 SysToolChangePwd websGetVar stack-based overflow

A vulnerability was identified in Tenda AC15 15.03.05.18. This affects the function websGetVar of the file /goform/SysToolChangePwd. Such manipulation of the argument oldPwd/newPwd/cfmPwd leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used.

HighCVSS 7.4 · v4.0—No exploit No fix recorded
Published
Apr 8, 2026
Updated
Jul 24, 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

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
tendaac15 firmware
tendaac15

Affected versions

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

  • tenda ac15 firmware15.03.05.18

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 AC15

    • 15.03.05.18affected

Same product

tenda: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-10987The goform/setUsbUnload endpoint of Tenda AC15 AC1900 version 15.03.05.19 allows remote attackers to execute arbitrary system commands via tKEV
    93Now
  • CVE-2022-28557There is a command injection vulnerability at the /goform/setsambacfg interface of Tenda AC15 US_AC15V1.0BR_V15.03.05.20_multi_TDE01.bin dev
    46Plan
  • CVE-2022-40851Tenda AC15 V15.03.05.19 contained a stack overflow via the function fromAddressNat.
    42Plan
  • CVE-2026-24105An issue was discovered in goform/formsetUsbUnload in Tenda AC15V1.0 V15.03.05.18_multi.
    40Plan
  • CVE-2026-24101An issue was discovered in goform/formSetIptv in Tenda AC15V1.0 V15.03.05.18_multi.
    40Plan
  • CVE-2025-25632Tenda AC15 v15.03.05.19 is vulnerable to Command Injection via the handler function in /goform/telnet.
    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-2025-0566444 days apartTenda AC15 SetDevNetName formSetDevNetName stack-based overflow
    37Monitor
  • CVE-2025-3786355 days apartTenda AC15 WifiExtraSet fromSetWirelessRepeat buffer overflow
    34Monitor
  • CVE-2025-5850304 days apartTenda AC15 HTTP POST Request SetLEDCf formsetschedled buffer overflow
    31Monitor
  • CVE-2026-497512 days apartTenda AC15 POST Request setcfm formSetCfm memory corruption
    29Monitor
  • CVE-2026-340038 days apartTenda AC15 TextEditingConversion stack-based overflow
    29Monitor
  • CVE-2025-11389183 days apartTenda AC15 saveAutoQos stack-based 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