CVE-2026-63077
JetBrains — JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
JetBrains · in CISA KEV since 2026-08-05
ExigentCISA federal deadline · Overdue by 2 monthsRansomwareCISA KEVActively Exploited
95
EVRS 95 of 100 Immediate
Out-of-Band / Urgent Remediation
Rank 12 of 2,960 tracked
Why it scores 95
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and associated with known ransomware campaigns.
- CISA KEVApplied
- RansomwareApplied
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyApplied
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
No fixed version identified yetEvidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 9.8 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.896 (99.79th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Known | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2026-08-08 · CISA federal deadline · Overdue by 2 months | CISA KEV |