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01 Record

CVE-2021-25761

In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector

02 Description

In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.54% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 45.8% of scored records. A rank, not a probability.
NVD base score
5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-02-03 15:21Z5 YR AGO
Last updated
2024-08-03 20:11Z2 YR AGO
Reserved
2021-01-21
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-326Inadequate Encryption StrengthClass
Data version
5.1
Document digest
8adf589ce34cf338b83f50f3dabb2a1493d5b382136035123ae1aed3fffdac2c

05 Affected products

VendorProductVersionsPlatforms
jetbrainsktorNot specified—

06 References