CVE-2021-33270: dlink dir-809_firmware Out-of-bounds Write
CVSS: 10.0v2.0HighModified
Published 01-12-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-33270 is a high (CVSS 10.0) Out-of-bounds Write vulnerability in dlink dir-809_firmware. EPSS estimates a 3.96% chance of exploitation in the next 30 days, higher than 90.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
10.0/10
010
High · v2.0 (NVD)EPSS score
3.96%
0%100%
Low · +0.13 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 01-12-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_800462c4 in /formAdvFirewall. This vulnerability is triggered via a crafted POST request.
CVSS metrics
2 scores · 1 source · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesSingle source
High 10.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
3.96%
Chance of exploitation in the next 30 days
Percentile
90%
Versus all other CVEs
30-day change
+0.13 pp
From 3.83% on 19-09-2026
19-09-202619-10-2026
EPSS score3.96%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundIot Poc
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Dlink1 product
- dir-809_firmware≤ 1.12wwb03
1 vendor · 1 product
References
2 links- github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06X Refsource MISCExploitThird Party Advisory