CVE-2020-1045

Asp.Net Core vulnerability

CVSS

7.5

EPSS

6.0%

EPSS pct

93th

Exploited

No known

A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names. The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded. The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.

Affected vendor

Microsoft

Affected product

Asp.Net Core

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Published

2020-09-11

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 6.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2020-1045

Confirm whether Microsoft Asp.Net Core is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2020-1045.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-1045

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-1045 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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