CVE-2021-43116
Use of Hard-coded Credentials in Nacos
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
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
- High
Exploit likelihood
What each source reports
NVD Score used
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
- Record
CVE-2021-43116- 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-287
- Updated
- 2026-11-02
CVE List No score
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
- Record
CVE-2021-43116- Updated
- 2026-11-02
EUVDEUVD-2022-6208 No score
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
- Record
EUVD-2022-6208- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2g86-r6w2-wqqr
Use of Hard-coded Credentials in Nacos
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
- Record
GHSA-2g86-r6w2-wqqr- 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 - Weakness
- CWE-287, CWE-798
- Updated
- 2026-11-02
OSV
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
- Record
CVE-2021-43116- 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
OSVGHSA-2g86-r6w2-wqqr
Use of Hard-coded Credentials in Nacos
An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.
- Record
GHSA-2g86-r6w2-wqqr- 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 - Weakness
- CWE-287, CWE-798
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
com.alibaba.nacos:nacos-clientMaven |
through 2.0.3 | None known |
com.alibaba.nacos:nacos-clientMaven |
through 2.0.3, plus listed versions 0.1.00.2.00.2.10.2.1-RC10.3.0 Show 45 moreShow less0.3.0-RC10.4.00.5.00.6.00.6.10.6.20.8.00.8.10.8.20.9.00.9.11.0.01.0.0-RC11.0.0-RC21.0.0-RC31.0.0-RC41.0.11.1.01.1.11.1.21.1.31.1.41.2.01.2.0-beta.01.2.0-beta.11.2.11.3.01.3.11.3.1-BETA1.3.1-BETA.11.3.21.3.31.4.01.4.0-BETA1.4.11.4.21.4.31.4.41.4.51.4.61.4.71.4.82.0.02.0.0-ALPHA.12.0.0-ALPHA.2 |
None known |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Nacos 2.0.3 - Access Control vulnerability | 2023-04-03 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43116 is a high vulnerability (CVSS 8.8) in Alibaba Nacos, published July 5, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 7.46%, the 94th percentile. No source names a fixed version.
References
Left out here: 3 versions. The JSON record has them.