How severe is CVE-2021-43116?

CVE-2021-43116 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43116 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43116?

CVE-2021-43116 affects Alibaba Nacos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43116?

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-2021-43116 published?

CVE-2021-43116 was published on 2022-07-05 and last updated on 2026-06-17.

CVE-2021-43116

CVE-2021-43116 is a high-severity vulnerability in Alibaba Nacos 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Alibaba Nacos
Published: 2022-07-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-43116?: 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.
How severe is CVE-2021-43116?: CVE-2021-43116 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43116 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43116?: CVE-2021-43116 affects Alibaba Nacos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43116?: 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-2021-43116 published?: CVE-2021-43116 was published on 2022-07-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*

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