SonicWall SonicOS SSLVPN Improper Authentication Vulnerability
SonicWall SonicOS contains an improper authentication vulnerability in the SSLVPN authentication mechanism that allows a remote attacker to bypass authentication.
- Vendor
- SonicWall
- Product
- SonicOS
- CVSS
- 9.8
- EPSS (exploit probability)
- 95.3%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2024-53704 being exploited?
Yes. CISA added CVE-2024-53704 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 95.3% (scored October 16, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other SonicWall SonicOS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2024-40766 SonicWall SonicOS Improper Access Control Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 18.4% | |
| CVE-2020-5135 SonicWall SonicOS Buffer Overflow Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 26.9% |