CVE-2018-9860

Name: CVE-2018-9860
Creator: NVD / NIST
Published: 2018-04-12T05:29:00.22+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.38%

Last modified Jun 17, 2026

CVE-2018-9860 is a vulnerability of currently unknown severity. An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. EPSS estimates a 1.38% chance of exploitation in the next 30 days.

Description

An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.

Metrics

EPSS Probability

1.38%

68.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-193

Affected Software

Vendor	Product	Versions
Botan Project	Botan	>= 1.11.32, < 2.6.0

References

https://botan.randombit.net/security.htmlVendor Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7434Issue Tracking
https://botan.randombit.net/security.htmlVendor Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7434Issue Tracking

Timeline

Published: Apr 12, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-9860?

How severe is CVE-2018-9860?

Severity scoring for CVE-2018-9860 is pending analysis. The EPSS model estimates a 1.38% probability of exploitation in the next 30 days.

How do I fix CVE-2018-9860?

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-2018-9860?

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

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Source: NVD / NIST