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CVE-2021-31756: tenda ac11_firmware Out-of-bounds Write

CVSS: 10.0v2.0HighModified
Published 07-05-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-31756 is a high (CVSS 10.0) Out-of-bounds Write vulnerability in tenda ac11_firmware. EPSS estimates a 2.90% chance of exploitation in the next 30 days, higher than 86.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
10.0/10
010
High · v2.0 (NVD)
EPSS score
2.90%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 07-05-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /gofrom/setwanType allows attackers to execute arbitrary code on the system via a crafted post request. This occurs when input vector controlled by malicious attack get copied to the stack variable.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

2.90%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 2.90% on 22-09-2026

22-09-202622-10-2026
EPSS score
2.90%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Iot Cve

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Tenda1 product

1 vendor · 1 product

References

1 links