PatchTheCVECVE-2021-20783: Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijac
CVE-2021-20783 is a high-severity flaw (CVSS 8.8) affecting optical bb unit e-wmta firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijack the authentication of administrators via a specially crafted page.
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.6% (top 54%) |
| CISA exploited list | No |
| Weakness | CWE-352 |
| Published | 2021-07-30 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-20783?
optical bb unit e-wmta firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-20783 being exploited?
CVE-2021-20783 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-20783 affect?
CVE-2021-20783 affects optical bb unit e-wmta firmware. Severity is high (CVSS 8.8). Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijack the authentication of administrators via a specially crafted page.
How urgent is CVE-2021-20783?
Priority 42/100. High severity