What is CVE-2025-65849?

CVE-2025-65849 is a critical-severity vulnerability in N/a, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 9.1/10. Published 2025-12-08.

How severe is CVE-2025-65849?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in N/a

CVE-2025-65849

A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction. NOTE: this is disputed by the Supplier because the product's objective is "to discourage automated scraping / bots, not guarantee resistance to determined attackers." The documentation states “the goal is not to provide a secure cryptographic algorithm but to use a proof-of-work mechanism that allows any capable device to decrypt the hidden data.”

Vulnerability class: POODLE (CVE-2014-3566)

EPSS: 0.002 (9.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

Frequently asked questions

What is CVE-2025-65849?: CVE-2025-65849 is a critical-severity vulnerability in N/a, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 9.1/10. Published 2025-12-08.
How severe is CVE-2025-65849?: Critical severity. CVSS v3 base score is 9.1 out of 10.