CVE-2023-48051Network attack vector

Sensitive-information decryption via PKCS#1 v1.5 padding

Published Nov 20, 2023 · Updated Aug 2, 2024

Use of weak RSA padding in upydev 0.4.3 allows remote attackers to decrypt sensitive information via chosen-ciphertext attacks. The keygen.py password-refresh path encrypts a newly generated WebREPL password with RSA PKCS#1 v1.5 padding before sending it to the device for decryption. The published issue does not identify the oracle behavior needed to complete the attack; the bounded reported impact is disclosure of encrypted messages or the transferred password.

CVSS severity7.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of weak RSA padding in upydev 0.4.3 allows remote attackers to decrypt sensitive information via chosen-ciphertext attacks. The keygen.py password-refresh path encrypts a newly generated WebREPL password with RSA PKCS#1 v1.5 padding before sending it to the device for decryption. The published issue does not identify the oracle behavior needed to complete the attack; the bounded reported impact is disclosure of encrypted messages or the transferred password.

The record

CVE
CVE-2023-48051
Published
Nov 20, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-326
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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