How severe is CVE-2023-49208?

CVE-2023-49208 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-49208 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-49208?

CVE-2023-49208 affects Glewlwyd Sso Server Project Glewlwyd Sso Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-49208?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-49208 published?

CVE-2023-49208 was published on 2023-11-23 and last updated on 2026-06-17.

CVE-2023-49208

CVE-2023-49208 is a critical-severity vulnerability in Glewlwyd Sso Server Project Glewlwyd Sso Server with a CVSS 3.x base score of 9.8. 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Glewlwyd Sso Server Project Glewlwyd Sso Server
Published: 2023-11-23
Last modified: 2026-06-17

Description

scheme/webauthn.c in Glewlwyd SSO server before 2.7.6 has a possible buffer overflow during FIDO2 credentials validation in webauthn registration.

Frequently asked questions

What is CVE-2023-49208?: scheme/webauthn.c in Glewlwyd SSO server before 2.7.6 has a possible buffer overflow during FIDO2 credentials validation in webauthn registration.
How severe is CVE-2023-49208?: CVE-2023-49208 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-49208 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-49208?: CVE-2023-49208 affects Glewlwyd Sso Server Project Glewlwyd Sso Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-49208?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-49208 published?: CVE-2023-49208 was published on 2023-11-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:glewlwyd_sso_server_project:glewlwyd_sso_server:*:*:*:*:*:*:*:*

More vulnerabilities in Glewlwyd Sso Server Project Glewlwyd Sso Server

CVE-2022-27240 — Critical (CVSS 9.8): scheme/webauthn.c in Glewlwyd SSO server 2.x before 2.6.2 has a buffer overflow associated with a webauthn assertion.
CVE-2021-40818 — Critical (CVSS 9.8): scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow during FIDO2 signature validation in…
CVE-2024-25715 — Medium (CVSS 6.1): Glewlwyd SSO server 2.x through 2.7.6 allows open redirection via redirect_uri.

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