CVE-2021-4030: zyxel armor z1 (nbg6816) firmware Cross-Site Request Forgery (CSRF)
CVSS: 8.8v3.1HighModified
Published 22-02-2022Last modified 03-08-2024
Vulnerability summary
CVE-2021-4030 is a high (CVSS 8.8) Cross-Site Request Forgery (CSRF) vulnerability in zyxel armor z1 (nbg6816) firmware. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.8% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
0.44%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 22-02-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A cross-site request forgery vulnerability in the HTTP daemon of the Zyxel ARMOR Z1/Z2 firmware could allow an attacker to execute arbitrary commands if they coerce or trick a local user to visit a compromised website with malicious scripts.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSources2 sources · 8.0–8.8
- CVE.orgCNA8.0HighCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HDiffers
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.44%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
0.00 pp
From 0.44% on 19-09-2026
19-09-202619-10-2026
EPSS score0.44%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Zyxel4 products
- armor z1 (nbg6816) firmware1.00(AAWB.10)C0
- armor z2 (nbg6817) firmware1.00(ABCS.10)C0
- nbg6816_firmware1.00\(aawb.10\)c0
- nbg6817_firmware< 1.00\(abcs.11\)c0
1 vendor · 4 products
References
1 links- www.zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtmlX Refsource CONFIRMVendor Advisory