CVE-2021-26557
CVE-2021-26557 is a high-severity vulnerability in Octopus Tentacle with a CVSS 3.x base score of 7.8. 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-426.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 4.4
- EPSS exploit prediction: 0% (23rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-426
- Affected product: Octopus Tentacle
- Published:
- Last modified:
Description
When Octopus Tentacle is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.
Frequently asked questions
- What is CVE-2021-26557?
- When Octopus Tentacle is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.
- How severe is CVE-2021-26557?
- CVE-2021-26557 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-26557 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-26557?
- CVE-2021-26557 affects Octopus Tentacle. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-26557?
- 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-2021-26557 published?
- CVE-2021-26557 was published on 2021-10-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:octopus:tentacle:*:*:*:*:*:*:*:*
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