CVE-2021-34430: eclipse tinydtls
CVSS: 7.5v3.1HighModified
Published 08-07-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-34430 is a high (CVSS 7.5) vulnerability in eclipse tinydtls. EPSS estimates a 1.04% chance of exploitation in the next 30 days, higher than 63.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.04%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 08-07-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Eclipse TinyDTLS through 0.9-rc1 relies on the rand function in the C library, which makes it easier for remote attackers to compute the master key and then decrypt DTLS traffic.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
1.04%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
0.00 pp
From 1.04% on 19-09-2026
19-09-202619-10-2026
EPSS score1.04%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugs.eclipse.org)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.
- CWE-326Inadequate Encryption StrengthThe product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.
Affected systems
Eclipse1 product
- tinydtls≤ 0.8.2 | 0.9:rc1
The eclipse foundation1 product
- eclipse tinydtls≥ unspecified, ≤ 0.9-rc1
2 vendors · 2 products