How severe is CVE-2024-21502?

CVE-2024-21502 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-2024-21502 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21502?

CVE-2024-21502 affects Antonkueltz Fastecdsa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-21502?

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.

Does CVE-2024-21502 have an EU (EUVD) identifier?

Yes. CVE-2024-21502 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0060.

When was CVE-2024-21502 published?

CVE-2024-21502 was published on 2024-02-24 and last updated on 2026-06-17.

CVE-2024-21502

CVE-2024-21502 is a high-severity vulnerability in Antonkueltz Fastecdsa 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-908.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0060
Weakness: CWE-908
Affected product: Antonkueltz Fastecdsa
Published: 2024-02-24
Last modified: 2026-06-17

Description

Versions of the package fastecdsa before 2.3.2 are vulnerable to Use of Uninitialized Variable on the stack, via the curvemath_mul function in src/curveMath.c, due to being used and interpreted as user-defined type. Depending on the variable's actual value it could be arbitrary free(), arbitrary realloc(), null pointer dereference and other. Since the stack can be controlled by the attacker, the vulnerability could be used to corrupt allocator structure, leading to possible heap exploitation. The attacker could cause denial of service by exploiting this vulnerability.

Frequently asked questions

What is CVE-2024-21502?: Versions of the package fastecdsa before 2.3.2 are vulnerable to Use of Uninitialized Variable on the stack, via the curvemath_mul function in src/curveMath.c, due to being used and interpreted as user-defined type. Depending on the variable's actual value it could be arbitrary free(), arbitrary realloc(), null pointer dereference and other. Since the stack can be controlled by the attacker, the vulnerability could be used to corrupt allocator structure, leading to possible heap exploitation. The attacker could cause denial of service by exploiting this vulnerability.
How severe is CVE-2024-21502?: CVE-2024-21502 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-2024-21502 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21502?: CVE-2024-21502 affects Antonkueltz Fastecdsa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-21502?: 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.
Does CVE-2024-21502 have an EU (EUVD) identifier?: Yes. CVE-2024-21502 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0060.
When was CVE-2024-21502 published?: CVE-2024-21502 was published on 2024-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:antonkueltz:fastecdsa:*:*:*:*:*:*:*:*

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