How severe is CVE-2019-9689?

CVE-2019-9689 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-9689 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9689?

CVE-2019-9689 affects Axtls Project Axtls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9689?

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-2019-9689 published?

CVE-2019-9689 was published on 2019-12-03 and last updated on 2026-06-17.

CVE-2019-9689

CVE-2019-9689 is a high-severity vulnerability in Axtls Project Axtls with a CVSS 3.x base score of 7.5. 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-120.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Axtls Project Axtls
Published: 2019-12-03
Last modified: 2026-06-17

Description

process_certificate in tls1.c in Cameron Hamilton-Rich axTLS through 2.1.5 has a Buffer Overflow via a crafted TLS certificate handshake message with zero certificates.

Frequently asked questions

What is CVE-2019-9689?: process_certificate in tls1.c in Cameron Hamilton-Rich axTLS through 2.1.5 has a Buffer Overflow via a crafted TLS certificate handshake message with zero certificates.
How severe is CVE-2019-9689?: CVE-2019-9689 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-9689 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9689?: CVE-2019-9689 affects Axtls Project Axtls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9689?: 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-2019-9689 published?: CVE-2019-9689 was published on 2019-12-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:axtls_project:axtls:*:*:*:*:*:*:*:*

More vulnerabilities in Axtls Project Axtls

CVE-2019-8981 — Critical (CVSS 9.8): tls1.c in Cameron Hamilton-Rich axTLS before 2.1.5 has a Buffer Overflow via a crafted sequence of TLS packets because…
CVE-2019-10013 — High (CVSS 7.5): The asn1_signature function in asn1.c in Cameron Hamilton-Rich axTLS through 2.1.5 has a Buffer Overflow that allows…
CVE-2018-16253 — Medium (CVSS 5.9): In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not properly…
CVE-2018-16150 — Medium (CVSS 5.9): In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not reject…
CVE-2018-16149 — Medium (CVSS 5.9): In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification blindly trusts the…
CVE-2023-33613 — Medium (CVSS 5.5): axTLS v2.1.5 was discovered to contain a heap buffer overflow in the bi_import function in axtls-code/crypto/bigint.c.…

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