Vulnerability in Microsoft Asp.net Core 2.1
CVE-2020-1045
<p>A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.</p> <p>The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second coo…
EPSS: 0.204 (95.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C.
Affected products
- Microsoft Asp.net Core 2.1 — versions 2.0
- Microsoft Asp.net Core 3.1 — versions 3.0
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045
- FEDORA-2020-e2deb72e0f (vendor-advisory)
- FEDORA-2020-48fa1ad65c (vendor-advisory)
- github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md
- security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600
- access.redhat.com/errata/RHSA-2020:3699
Frequently asked questions
- What is CVE-2020-1045?
- CVE-2020-1045 is a high-severity vulnerability in Microsoft Asp.net Core 2.1. CVSS score: 7.5/10. Published 2020-09-11.
- How severe is CVE-2020-1045?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-1045 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.