Microsoft Windows CryptoAPI Spoofing Vulnerability
Microsoft Windows CryptoAPI (Crypt32.dll) contains a spoofing vulnerability in the way it validates Elliptic Curve Cryptography (ECC) certificates. An attacker could exploit the vulnerability by using a spoofed code-signing certificate to sign a malicious executable, making it appear the file was from a trusted, legitimate source. A successful exploit could also allow the attacker to conduct man-in-the-middle attacks and decrypt confidential information on user connections to the affected software. The vulnerability is also known under the moniker of CurveBall.
- Vendor
- Microsoft
- Product
- Windows
- CVSS
- 8.1
- EPSS (exploit probability)
- 89.1%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-0601 being exploited?
Yes. CISA added CVE-2020-0601 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 89.1% (scored October 25, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2020-0601 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (181 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.
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|---|---|---|---|---|
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| CVE-2008-4250 Microsoft Windows Buffer Overflow Vulnerability | [ CRITICAL ] | 9.8 | 98.8% | |
| CVE-2026-32202 Microsoft Windows Protection Mechanism Failure Vulnerability | [ MEDIUM ] | 4.3 | 71.3% | |
| CVE-2025-60710 Microsoft Windows Link Following Vulnerabilityransomware use | [ HIGH ] | 7.8 | 4.6% | |
| CVE-2023-36424 Microsoft Windows Out-of-Bounds Read Vulnerability | [ HIGH ] | 7.8 | 12.1% |