CVE-2023-52353: arm mbed_tls Session Fixation
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2023-52353
Published 21-01-2024Last modified 30-05-2025
Vulnerability summary
CVE-2023-52353 is a high (CVSS 7.5) Session Fixation vulnerability in arm mbed_tls. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.46%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 21-01-2024PublishedVulnerability first disclosed.
- 30-05-2025Last modifiedVulnerability information updated.
Description
An issue was discovered in Mbed TLS through 3.5.1. In mbedtls_ssl_session_reset, the maximum negotiable TLS version is mishandled. For example, if the last connection negotiated TLS 1.2, then 1.2 becomes the new maximum.
CVSS metrics
3 scores · 3 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.46%
Chance of exploitation in the next 30 days
Percentile
39%
Versus all other CVEs
30-day change
0.00 pp
From 0.46% on 21-09-2026
21-09-202621-10-2026
EPSS score0.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundMbedtls
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Arm1 product
- mbed_tls< 3.5.2
Ubuntu1 product
- mbedtlsAll versions (No fix recorded)
2 vendors · 2 products