CVE-2020-36423: arm mbed_tls
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-36423DEBIAN-CVE-2020-36423
Published 19-07-2021Last modified 04-08-2024
Vulnerability summary
CVE-2020-36423 is a high (CVSS 7.5) vulnerability in arm mbed_tls. EPSS estimates a 1.20% chance of exploitation in the next 30 days, higher than 67.5% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.20%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 19-07-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Arm Mbed TLS before 2.23.0. A remote attacker can recover plaintext because a certain Lucky 13 countermeasure doesn't properly consider the case of a hardware accelerator.
CVSS metrics
4 scores · 3 sources · 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:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
1.20%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
0.00 pp
From 1.20% on 19-09-2026
19-09-202619-10-2026
EPSS score1.20%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- mbedtls< 2.16.9-0.1
- debian_linuxEOL10.0
Arm1 product
- mbed_tls< 2.16.7 | ≥ 2.17.0, < 2.23.0
Ubuntu1 product
- mbedtlsAll versions (No fix recorded)
3 vendors · 4 products
