Buffer overflow in Totolink A810r
CVE-2025-28021
TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in the downloadFile.cgi through the v14 and v3 parameters
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Totolink A810r
- Totolink A810r Firmware — versions 4.1.2cu.5182_b20201026
Weakness classification (CWE)
Public proof-of-concept exploits
References
- locrian-lightning-dc7.notion.site/BufferOverflow1-1948e5e2b1a280e8aa5ad87964c5c… (Exploit, Third Party Advisory)
- locrian-lightning-dc7.notion.site/CVE-2025-28021-BufferOverflow1-1948e5e2b1a280… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-28021?
- CVE-2025-28021 is a high-severity vulnerability in Totolink A810r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.3/10. Published 2025-04-23.
- How severe is CVE-2025-28021?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2025-28021 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.