CVE-2024-21502: Versions of the package fastecdsa before 2.3.2 are vulnerable to Use of Uninitialized Variable on the stack, v

Q: How do I fix CVE-2024-21502?

fastecdsa: upgrade to 2.3.2. Exact commands for each OS are on this page.

Q: Is CVE-2024-21502 being exploited?

CVE-2024-21502 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-21502 affect?

CVE-2024-21502 affects fastecdsa. Severity is high (CVSS 7.5). 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 variabl

Q: How urgent is CVE-2024-21502?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2024-21502 is a high-severity flaw (CVSS 7.5) affecting fastecdsa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 st

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-457, CWE-908
Published	2024-02-24
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: antonkueltz

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-24 05:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

antonkueltz fastecdsa UPGRADE

Affected: < 2.3.2

Fixed in: 2.3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fastecdsa || rpm -q fastecdsa || fastecdsa --version

2. UPGRADE to 2.3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fastecdsa

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fastecdsa

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-21502?

fastecdsa: upgrade to 2.3.2. Exact commands for each OS are on this page.

Is CVE-2024-21502 being exploited?

CVE-2024-21502 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-21502 affect?

CVE-2024-21502 affects fastecdsa. Severity is high (CVSS 7.5). 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 variabl

How urgent is CVE-2024-21502?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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