Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in STM32 cryptographic firmware…
Priority LOW 28CWE-327Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-327.
Summary
Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in STM32 cryptographic firmware library software expansion for STM32Cube (UM1924). The vulnerability can allow one to use Bleichenbacher's oracle attack to decrypt an encrypted ciphertext by making successive queries to the server using the vulnerable library, resulting in remote information disclosure.
Why it matters now
EPSS 0.00938 61st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 22
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:st:stm32cubef0:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubef1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubef2:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubef3:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubef4:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubef7:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubeg0:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubeg4:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubeh7:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubeide:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
- cpe:2.3:a:st:stm32cubef0:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubef1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubef2:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubef3:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubef4:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubef7:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubeg0:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubeg4:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubeh7:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubeide:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
Show 12 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:st:stm32cubel0:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubel1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubel4:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubel4\+:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubel5:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubemonitor:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubemp1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubemx:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubeprogrammer:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubewb:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:st:stm32cubewl:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | STMicroelectronics |
| cpe:2.3:a:ietf:public_key_cryptography_standards_\#1:1.5:*:*:*:*:*:*:* | 1.5 | Vulnerable | IETF |
- cpe:2.3:a:st:stm32cubel0:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubel1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubel4:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubel4\+:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubel5:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubemonitor:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubemp1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubemx:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubeprogrammer:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubewb:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:st:stm32cubewl:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·STMicroelectronics
- cpe:2.3:a:ietf:public_key_cryptography_standards_\#1:1.5:*:*:*:*:*:*:* Versions 1.5 Vulnerable ·IETF
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-20949
- 2026-10-03 Alias added: GHSA-7p98-xcgc-gwhj
References
Sources
- CVE-2020-20949 · CVE Program
- CVE-2020-20949 · NVD
- FIRST EPSS
- GHSA-7p98-xcgc-gwhj · GitHub Advisory Database · CC BY 4.0
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