7.5

CVE-2021-34433: eclipse californium

CVSS: 7.5v3.1HighModified
Published 20-08-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-34433 is a high (CVSS 7.5) vulnerability in eclipse californium. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 25.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.34%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 20-08-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In Eclipse Californium version 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3, the certificate based (x509 and RPK) DTLS handshakes accidentally succeeds without verifying the server side's signature on the client side, if that signature is not included in the server's ServerKeyExchange.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

0.00 pp

From 0.34% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Eclipse1 product
  • californium≥ 2.0.0, < 2.6.5 | 3.0.0:m1 | 3.0.0:m2 | 3.0.0:m3
The eclipse foundation1 product
  • eclipse californium≥ 2.0.0, < unspecified | ≥ unspecified, ≤ 2.6.4 | ≥ 3.0.0-M1, < unspecified | ≥ unspecified, ≤ 3.0.0-M3

2 vendors · 2 products

References

1 links