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CVE-2021-43298

CRITICALCVSS 9.8/10EPSS 2.26%

Last modified

CVE-2021-43298 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no rate-limiting. This means that an unauthenticated network attacker can brute-force the HTTP basic password, byte-by-byte, by recording the webserver's response time until the unauthorized (401) response.. EPSS estimates a 2.26% chance of exploitation in the next 30 days.

Description

The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no rate-limiting. This means that an unauthenticated network attacker can brute-force the HTTP basic password, byte-by-byte, by recording the webserver's response time until the unauthorized (401) response.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
2.26%

80.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
EmbedthisGoahead< 5.1.4

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-43298?
The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no rate-limiting. This means that an unauthenticated network attacker can brute-force the HTTP basic password, byte-by-byte, by recording the webserver's response time until the unauthorized (401) response.
How severe is CVE-2021-43298?
CVE-2021-43298 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.26% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43298?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43298?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST