CVE-2022-23002

Point Compression/Decompression of NIST P-256 points with X coordinate of zero

MEDIUM
5.3
CVSS Score
Published: July 29, 2022 at 06:52 PM UTC
Updated: June 17, 2026 at 04:29 AM UTC
1 product affected across 1 vendorSweet B

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.7%

Description

When compressing or decompressing a point on the NIST P-256 elliptic curve with an X coordinate of zero, the resulting output is not properly reduced modulo the P-256 field prime and is invalid. The resulting output will cause an error when used in other operations. This may be leveraged by an attacker to cause an error scenario in applications which use the library, resulting in a limited denial of service for an individual user. The scope of impact cannot extend to other components.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Sweet B Library ≤ v < v21
Affected range stops below v2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

5.3MEDIUMWDC PSIRT
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-703NVD-CWE-noinfo

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