How severe is CVE-2017-15883?

CVE-2017-15883 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-15883 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-15883?

CVE-2017-15883 primarily affects Progress Sitefinity. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-15883?

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

When was CVE-2017-15883 published?

CVE-2017-15883 was published on 2018-01-08 and last updated on 2026-06-17.

CVE-2017-15883

CVE-2017-15883 is a critical-severity vulnerability in Progress Sitefinity with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Progress Sitefinity
Published: 2018-01-08
Last modified: 2026-06-17

Description

Sitefinity 5.1, 5.2, 5.3, 5.4, 6.x, 7.x, 8.x, 9.x, and 10.x allow remote attackers to bypass authentication and consequently cause a denial of service on load balanced sites or gain privileges via vectors related to weak cryptography.

Frequently asked questions

What is CVE-2017-15883?: Sitefinity 5.1, 5.2, 5.3, 5.4, 6.x, 7.x, 8.x, 9.x, and 10.x allow remote attackers to bypass authentication and consequently cause a denial of service on load balanced sites or gain privileges via vectors related to weak cryptography.
How severe is CVE-2017-15883?: CVE-2017-15883 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-15883 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-15883?: CVE-2017-15883 primarily affects Progress Sitefinity. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-15883?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-15883 published?: CVE-2017-15883 was published on 2018-01-08 and last updated on 2026-06-17.

References

Affected products (20)

cpe:2.3:a:progress:sitefinity:5.1:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:5.2:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:5.3:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:5.4:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:6.0:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:6.1:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:6.2:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:6.3:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:7.0:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:7.1:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:7.2:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:7.3:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:8.0:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:8.1:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:8.2:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:9.0:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:9.1:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:9.2:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:10.0:*:*:*:*:*:*:*
cpe:2.3:a:progress:sitefinity:10.1:*:*:*:*:*:*:*

More vulnerabilities in Progress Sitefinity

CVE-2026-7312 — Critical (CVSS 10.0): CWE‑522: Insufficiently Protected Credentials in web services in Progress Sitefinity version from 14.0.7700 to…
CVE-2026-7198 — Critical (CVSS 9.8): CWE-284: Improper Access Control in web services in Progress Sitefinity 15.4.8623 before 15.4.8630 allows a remote…
CVE-2023-29375 — Critical (CVSS 9.8): An issue was discovered in Progress Sitefinity 13.3 before 13.3.7647, 14.0 before 14.0.7736, 14.1 before 14.1.7826,…
CVE-2019-17392 — Critical (CVSS 9.8): Progress Sitefinity 12.1 has a Weak Password Recovery Mechanism for a Forgotten Password because the HTTP Host header…
CVE-2017-9248 — Critical (CVSS 9.8): Telerik.Web.UI.dll in Progress Telerik UI for ASP.NET AJAX before R2 2017 SP1 and Sitefinity before 10.0.6412.0 does…
CVE-2026-7201 — High (CVSS 8.8): CWE-639: Authorization Bypass Through User-Controlled Key in web services in Progress Sitefinity 15.2.x before…

All CVEs affecting Progress Sitefinity →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →