CVE-2007-6521

CRITICAL

Unspecified vulnerability in Opera before 9.25 allows remote attackers to execute arbitrary code via crafted TLS certificates.

Affects 1 product across 1 vendor.

CVSS 2.010.0
EPSS5.0%
Percentile92th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-310: Cryptographic Issues

Broad class covering misuse of cryptography: weak algorithms, insufficient key length, improper certificate validation.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2007. A critical vulnerability affects Opera systems (CVE-2007-6521). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2007-GLOBAL-019903-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2007-6521?
This vulnerability was disclosed in 2007. A critical vulnerability affects Opera systems (CVE-2007-6521). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2007-6521?
CVE-2007-6521 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 5.0%.
Is CVE-2007-6521 actively exploited?
No confirmed active exploitation of CVE-2007-6521 as of 2026-09-25.
How do I remediate CVE-2007-6521?
Priority: MEDIUM. PSIRT: [email protected]
What systems are affected by CVE-2007-6521?
CVE-2007-6521 affects Opera Opera Browser.
Vulnerability Details
CVE IDCVE-2007-6521
BSIDBS-2007-GLOBAL-019903-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2007-12-24
Last Modified2026-06-16
ICS Relevance0%
Weakness (CWE)
Cryptographic Issues
SourceNVD
Official Description

Unspecified vulnerability in Opera before 9.25 allows remote attackers to execute arbitrary code via crafted TLS certificates.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: Unspecified vulnerability in Opera before 9.25 allows remote attackers to execute arbitrary code via crafted TLS certificates. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Opera Opera Browser ≤ 9.24
Remediation

No official vendor advisory link on record. See the CVE record →

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 6870 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hashc786c7032e53172d56376536847b550664e1eee95f0d6506fe76477d857aa68672ea8141a7cf52ff1bae47e8f429a8b0f14b535d62ad372f0b9e0f42872aa43b
Related CVEs affecting Opera
CVE-2008-3079 10.0 Unspecified vulnerability in Opera before 9.51 on Windows allows attackers to... CVE-2008-4292 10.0 Opera before 9.52 does not check the CRL override upon encountering a certifi... CVE-2005-3059 10.0 Multiple unspecified vulnerabilities in Opera 8.50 on Linux and Windows have ... CVE-2007-5476 10.0 Unspecified vulnerability in Adobe Flash Player 9.0.47.0 and earlier, when ru... CVE-2008-4293 10.0 Unspecified vulnerability in Opera before 9.52 on Windows, when registered as...
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