How severe is CVE-2017-11667?

CVE-2017-11667 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11667 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11667?

CVE-2017-11667 primarily affects Openproject. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-11667?

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-2017-11667 published?

CVE-2017-11667 was published on 2017-07-26 and last updated on 2026-06-17.

CVE-2017-11667

CVE-2017-11667 is a high-severity vulnerability in Openproject with a CVSS 3.x base score of 8.1. 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-613.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-613
Affected product: Openproject
Published: 2017-07-26
Last modified: 2026-06-17

Description

OpenProject before 6.1.6 and 7.x before 7.0.3 mishandles session expiry, which allows remote attackers to perform APIv3 requests indefinitely by leveraging a hijacked session.

Frequently asked questions

What is CVE-2017-11667?: OpenProject before 6.1.6 and 7.x before 7.0.3 mishandles session expiry, which allows remote attackers to perform APIv3 requests indefinitely by leveraging a hijacked session.
How severe is CVE-2017-11667?: CVE-2017-11667 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11667 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11667?: CVE-2017-11667 primarily affects Openproject. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-11667?: 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-2017-11667 published?: CVE-2017-11667 was published on 2017-07-26 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*
cpe:2.3:a:openproject:openproject:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:openproject:openproject:7.0.1:*:*:*:*:*:*:*
cpe:2.3:a:openproject:openproject:7.0.2:*:*:*:*:*:*:*

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