02 Records
FEED: ACQUIRING
01 RecordSTATE: PUBLISHED
02 Description
CNA: NCSC.chTiming side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in Oberon PSA Crypto library
03 Exploitation and scoring
SRC: CISA, FIRST, NVD, RED HAT- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.- EPSS probability
- 0.09% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Ranks above 0.5% of scored records. A rank, not a probability.
- NVD base score
- 5.9 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVD analysis status
- Deferred. 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.
SCHEMA: 5.1
- Published
- 2025-08-29 09:19Z1 YR AGO
- Last updated
- 2025-08-29 13:46Z1 YR AGO
- Reserved
- 2025-07-09
- Assigning CNA
- NCSC.ch
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.9)
- CNA CVSS vector
- CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Weaknesses
- CWE-208Observable Timing DiscrepancyBase
- CWE-327Use of a Broken or Risky Cryptographic AlgorithmClass
- Data version
- 5.1
- Document digest
- c2283e5e197703a11a5f699f1d24d08c63e7cc5f90683839efda202c0980217f
05 Affected products
PAIRS: 1VendorProductVersionsPlatforms
SRC: CNA
Affected users should upgrade to Oberon PSA Crypto 1.5.1 or later.