How severe is CVE-2021-26804?

CVE-2021-26804 has a CVSS 3.x base score of 6.5, 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 high, and availability none.

Is CVE-2021-26804 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26804?

CVE-2021-26804 primarily affects Centreon Centreon Web. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26804?

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

When was CVE-2021-26804 published?

CVE-2021-26804 was published on 2021-05-04 and last updated on 2026-06-17.

CVE-2021-26804

CVE-2021-26804 is a medium-severity vulnerability in Centreon Centreon Web with a CVSS 3.x base score of 6.5. 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-276.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Centreon Centreon Web
Published: 2021-05-04
Last modified: 2026-06-17

Description

Insecure Permissions in Centreon Web versions 19.10.18, 20.04.8, and 20.10.2 allows remote attackers to bypass validation by changing any file extension to ".gif", then uploading it in the "Administration/ Parameters/ Images" section of the application.

Frequently asked questions

What is CVE-2021-26804?: Insecure Permissions in Centreon Web versions 19.10.18, 20.04.8, and 20.10.2 allows remote attackers to bypass validation by changing any file extension to ".gif", then uploading it in the "Administration/ Parameters/ Images" section of the application.
How severe is CVE-2021-26804?: CVE-2021-26804 has a CVSS 3.x base score of 6.5, 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 high, and availability none.
Is CVE-2021-26804 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26804?: CVE-2021-26804 primarily affects Centreon Centreon Web. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26804?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26804 published?: CVE-2021-26804 was published on 2021-05-04 and last updated on 2026-06-17.

References

https://medium.com/%40pedro.ferreira.phf/vulnerability-affecting-some-versions-of-centreon-2b34bd6dc621

Affected products (3)

cpe:2.3:a:centreon:centreon_web:19.10.18:*:*:*:*:*:*:*
cpe:2.3:a:centreon:centreon_web:20.04.8:*:*:*:*:*:*:*
cpe:2.3:a:centreon:centreon_web:20.10.2:*:*:*:*:*:*:*

More vulnerabilities in Centreon Centreon Web

CVE-2024-32501 — Critical (CVSS 9.8): A SQL Injection vulnerability exists in the updateServiceHost functionality in Centreon Web 24.04.x before 24.04.3,…
CVE-2018-11589 — Critical (CVSS 9.8): Multiple SQL injection vulnerabilities in Centreon 3.4.6 including Centreon Web 2.8.23 allow attacks via the searchU…
CVE-2018-11587 — Critical (CVSS 9.8): There is Remote Code Execution in Centreon 3.4.6 including Centreon Web 2.8.23 via the RPN value in the Virtual Metric…
CVE-2023-51633 — Critical (CVSS 9.6): Centreon sysName Cross-Site Scripting Remote Code Execution Vulnerability. This vulnerability allows remote attackers…
CVE-2024-55573 — Critical (CVSS 9.1): An issue was discovered in Centreon centreon-web 24.10.x before 24.10.3, 24.04.x before 24.04.9, 23.10.x before…
CVE-2024-53923 — Critical (CVSS 9.1): An issue was discovered in Centreon Web 24.10.x before 24.10.3, 24.04.x before 24.04.9, 23.10.x before 23.10.19,…

All CVEs affecting Centreon Centreon Web →

Other CWE-276 (Incorrect Default Permissions) vulnerabilities

CVE-2022-42150 — Critical (CVSS 10.0): TinyLab linux-lab v1.1-rc1 and cloud-labv0.8-rc2, v1.1-rc1 are vulnerable to insecure permissions. The default…
CVE-2020-29492 — Critical (CVSS 10.0): Dell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A remote…
CVE-2020-29491 — Critical (CVSS 10.0): Dell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A remote…
CVE-2025-40585 — Critical (CVSS 9.9): A vulnerability has been identified in Energy Services (All versions with G5DFR). Affected solutions using G5DFR…
CVE-2019-19896 — Critical (CVSS 9.9): In IXP EasyInstall 6.2.13723, there is Remote Code Execution via weak permissions on the Engine Service share. The…
CVE-2020-37129 — Critical (CVSS 9.8): Memu Play 7.1.3 contains an insecure folder permissions vulnerability that allows low-privileged users to modify the…

Browse all CWE-276 (Incorrect Default Permissions) vulnerabilities →