CVE-2012-1251

5.8 MEDIUM 0.6% exploit odds No fix listed

What it is

Opera before 9.63 does not properly verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.6% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2012-06-04 17:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:39 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.6% in the next 30 days (EPSS).
Severity: 5.8 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2012-06-04 17:55 UTC
Last modified: 2026-06-16 23:39 UTC
Exploit probability: 0.6% · EPSS, next 30 days
Weakness: CWE-310
Record status: Modified

Affected

Opera Browser ≤ 9.62
Opera Browser 1.00
Opera Browser 2.00
Opera Browser 2.10
Opera Browser 2.12
Opera Browser 3.00
Opera Browser 3.10
Opera Browser 3.21

Attack profile CVSS 2.0 · 5.8

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: Partial
Integrity: Partial
Availability: None

Raw vector

AV:N/AC:M/Au:N/C:P/I:P/A:N

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2012-1251.md and follow it. Check whether this project is affected by CVE-2012-1251. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record