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CVE-2021-31578

30
FAUCET Score

CVE-2021-31578 is a critical stack buffer overflow vulnerability in the Boa web server, affecting MediaTek EN7528 and EN7580 products and their firmware. This flaw allows for remote escalation of privilege by a proximal attacker without requiring user interaction or additional execution privileges. With a CVSS score of 9.8, it poses a severe risk, enabling full compromise of confidentiality, integrity, and availability. Currently, there is no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< tlm7.3.275.0-64CPE matchmatch criteria
cpe:2.3:o:mediatek:en7580_firmware:*:*:*:*:*:*:*:*
< tlm7.3.275.0-64CPE matchmatch criteria
cpe:2.3:o:mediatek:en7528_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 53rd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

corp.mediatek.com / product-security-acknowledgements
Vendor Advisory