How severe is CVE-2017-11879?

CVE-2017-11879 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11879 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11879?

CVE-2017-11879 affects Microsoft Asp.net Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-11879?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-11879 published?

CVE-2017-11879 was published on 2017-11-15 and last updated on 2026-06-17.

CVE-2017-11879

CVE-2017-11879 is a high-severity vulnerability in Microsoft Asp.net Core with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.3
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Microsoft Asp.net Core
Published: 2017-11-15
Last modified: 2026-06-17

Description

ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL aka "ASP.NET Core Elevation Of Privilege Vulnerability".

Frequently asked questions

What is CVE-2017-11879?: ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL aka "ASP.NET Core Elevation Of Privilege Vulnerability".
How severe is CVE-2017-11879?: CVE-2017-11879 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11879 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11879?: CVE-2017-11879 affects Microsoft Asp.net Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-11879?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-11879 published?: CVE-2017-11879 was published on 2017-11-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:asp.net_core:2.0:*:*:*:*:*:*:*

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