How severe is CVE-2021-27181?

CVE-2021-27181 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27181 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27181?

CVE-2021-27181 affects Altn Mdaemon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27181?

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-2021-27181 published?

CVE-2021-27181 was published on 2021-04-14 and last updated on 2026-06-17.

CVE-2021-27181

CVE-2021-27181 is a high-severity vulnerability in Altn Mdaemon with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Altn Mdaemon
Published: 2021-04-14
Last modified: 2026-06-17

Description

An issue was discovered in MDaemon before 20.0.4. Remote Administration allows an attacker to perform a fixation of the anti-CSRF token. In order to exploit this issue, the user has to click on a malicious URL provided by the attacker and successfully authenticate into the application. Having the value of the anti-CSRF token, the attacker may trick the user into visiting his malicious page and performing any request with the privileges of attacked user.

Frequently asked questions

What is CVE-2021-27181?: An issue was discovered in MDaemon before 20.0.4. Remote Administration allows an attacker to perform a fixation of the anti-CSRF token. In order to exploit this issue, the user has to click on a malicious URL provided by the attacker and successfully authenticate into the application. Having the value of the anti-CSRF token, the attacker may trick the user into visiting his malicious page and performing any request with the privileges of attacked user.
How severe is CVE-2021-27181?: CVE-2021-27181 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27181 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27181?: CVE-2021-27181 affects Altn Mdaemon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27181?: 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-2021-27181 published?: CVE-2021-27181 was published on 2021-04-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:altn:mdaemon:*:*:*:*:*:*:*:*

More vulnerabilities in Altn Mdaemon

CVE-2021-27182 — High (CVSS 8.8): An issue was discovered in MDaemon before 20.0.4. There is an IFRAME injection vulnerability in Webmail (aka…
CVE-2021-27183 — High (CVSS 7.2): An issue was discovered in MDaemon before 20.0.4. Administrators can use Remote Administration to exploit an Arbitrary…
CVE-2008-1358 — Medium (CVSS 6.5): Stack-based buffer overflow in the IMAP server in Alt-N Technologies MDaemon 9.6.4 allows remote authenticated users to…
CVE-2021-27180 — Medium (CVSS 6.1): An issue was discovered in MDaemon before 20.0.4. There is Reflected XSS in Webmail (aka WorldClient). It can be…
CVE-2019-8984 — Medium (CVSS 6.1): MDaemon Webmail 14.x through 18.x before 18.5.2 has XSS (issue 2 of 2).
CVE-2019-8983 — Medium (CVSS 6.1): MDaemon Webmail 14.x through 18.x before 18.5.2 has XSS (issue 1 of 2).

All CVEs affecting Altn Mdaemon →

Other CWE-352 (Cross-Site Request Forgery (CSRF)) vulnerabilities

CVE-2025-32642 — Critical (CVSS 10.0): Cross-Site Request Forgery (CSRF) vulnerability in appsbd Vite Coupon vite-coupon allows Remote Code Inclusion.This…
CVE-2025-23922 — Critical (CVSS 10.0): Cross-Site Request Forgery (CSRF) vulnerability in Harsh iSpring Embedder embed-ispring allows Upload a Web Shell to a…
CVE-2017-5145 — Critical (CVSS 10.0): An issue was discovered in Carlo Gavazzi VMU-C EM prior to firmware Version A11_U05, and VMU-C PV prior to firmware…
CVE-2019-25729 — Critical (CVSS 9.8): PDF Signer 3.0 contains a server-side template injection vulnerability that allows unauthenticated attackers to execute…
CVE-2025-48340 — Critical (CVSS 9.8): Cross-Site Request Forgery (CSRF) vulnerability in Danny Vink User Profile Meta Manager user-profile-meta allows…
CVE-2025-2907 — Critical (CVSS 9.8): The Order Delivery Date WordPress plugin before 12.3.1 does not have authorization and CSRF checks when importing…

Browse all CWE-352 (Cross-Site Request Forgery (CSRF)) vulnerabilities →