CVE-2021-21247
Post-Auth Unsafe Deserialization on BasePage (AJAX)
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, the application's BasePage registers an AJAX event listener (AbstractPostAjaxBehavior) in all pages other than the login page. This listener decodes and deserializes the data query parameter. We can access this listener by submitting a POST request to any page. This issue may lead to post-auth RCE This endpoint is subject to authentication and, therefore, requires a valid user to carry on the attack. This issue was addressed in 4.0.3 by encrypting serialization payload with secrets only known to server.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Post-Auth Unsafe Deserialization on BasePage (AJAX)
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, the application's BasePage registers an AJAX event listener (AbstractPostAjaxBehavior) in all pages other than the login page. This listener decodes and deserializes the data query parameter. We can access this listener by submitting a POST request to any page. This issue may lead to post-auth RCE This endpoint is subject to authentication and, therefore, requires a valid user to carry on the attack. This issue was addressed in 4.0.3 by encrypting serialization payload with secrets only known to server.
- Record
CVE-2021-21247- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
EUVDEUVD-2021-8630
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, the application's BasePage registers an AJAX event listener (AbstractPostAjaxBehavior) in all pages other than the login page. This listener decodes and deserializes the data query parameter. We can access this listener by submitting a POST request to any page. This issue may lead to post-auth RCE This endpoint is subject to authentication and, therefore, requires a valid user to carry on the attack. This issue was addressed in 4.0.3 by encrypting serialization payload with secrets only known to server.
- Record
EUVD-2021-8630- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N - Updated
- 2026-11-03
NVD
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, the application's BasePage registers an AJAX event listener (AbstractPostAjaxBehavior) in all pages other than the login page. This listener decodes and deserializes the data query parameter. We can access this listener by submitting a POST request to any page. This issue may lead to post-auth RCE This endpoint is subject to authentication and, therefore, requires a valid user to carry on the attack. This issue was addressed in 4.0.3 by encrypting serialization payload with secrets only known to server.
- Record
CVE-2021-21247- CVSS 3.1
- 9.6 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-74, CWE-502
- Updated
- 2026-11-02
OSV
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, the application's BasePage registers an AJAX event listener (AbstractPostAjaxBehavior) in all pages other than the login page. This listener decodes and deserializes the data query parameter. We can access this listener by submitting a POST request to any page. This issue may lead to post-auth RCE This endpoint is subject to authentication and, therefore, requires a valid user to carry on the attack. This issue was addressed in 4.0.3 by encrypting serialization payload with secrets only known to server.
- Record
CVE-2021-21247- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21247 is a critical vulnerability (CVSS 9.6) in Onedev Project Onedev, published January 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.52%, the 74th percentile. No source names a fixed version.