How severe is CVE-2020-1044?

CVE-2020-1044 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2020-1044 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-2020-1044?

CVE-2020-1044 primarily affects Microsoft Sql Server Reporting Services. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-1044?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-1044 published?

CVE-2020-1044 was published on 2020-09-11 and last updated on 2026-06-17.

CVE-2020-1044

CVE-2020-1044 is a medium-severity vulnerability in Microsoft Sql Server Reporting Services with a CVSS 3.x base score of 4.3. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Microsoft Sql Server Reporting Services
Published: 2020-09-11
Last modified: 2026-06-17

Description

A security feature bypass vulnerability exists in SQL Server Reporting Services (SSRS) when the server improperly validates attachments uploaded to reports. An attacker who successfully exploited this vulnerability could upload file types that were disallowed by an administrator. To exploit the vulnerability, an authenticated attacker would need to send a specially crafted request to an affected SSRS server. The update addresses the vulnerability by modifying how SSRS validates attachment uploads.

Frequently asked questions

What is CVE-2020-1044?: A security feature bypass vulnerability exists in SQL Server Reporting Services (SSRS) when the server improperly validates attachments uploaded to reports. An attacker who successfully exploited this vulnerability could upload file types that were disallowed by an administrator. To exploit the vulnerability, an authenticated attacker would need to send a specially crafted request to an affected SSRS server. The update addresses the vulnerability by modifying how SSRS validates attachment uploads.
How severe is CVE-2020-1044?: CVE-2020-1044 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2020-1044 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-2020-1044?: CVE-2020-1044 primarily affects Microsoft Sql Server Reporting Services. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-1044?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-1044 published?: CVE-2020-1044 was published on 2020-09-11 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1044

Affected products (2)

cpe:2.3:a:microsoft:sql_server_reporting_services:2017:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:sql_server_reporting_services:2019:*:*:*:*:*:*:*

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