CVE-2004-2491

LOWCVSS v2 · 2.62.6—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 2.6 — v2 rates that LOW (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:H/Au:N/C:N/I:P/A:N. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 6.3% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
2.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS v2: 2.6Exploit: Exploit-DB (verified) · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A race condition in Opera web browser 7.53 Build 3850 causes Opera to fill in the address bar before the page has been loaded, which allows remote attackers to spoof the URL in the address bar via the window.open and location.replace HTML parameters, which facilitates phishing attacks.

CVSS v2.0 (legacy)
2.6LOWNVD never assigned a CVSS v3 rating to this CVE
EG Score
2.6(low)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity26% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

December 31, 2004

Last Modified

June 16, 2026

References (12)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 13:25 UTCEG score recompute▲ 2.60
  2. 2026-07-25 14:11 UTCEPSS rescore
  3. 2026-07-24 14:11 UTCEPSS rescore
  4. 2026-07-23 00:47 UTCEG score recompute
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  6. 2026-07-22 23:51 UTCEG score recompute
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  8. 2026-07-18 09:59 UTCEPSS rescore
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  10. 2026-07-15 16:53 UTCEPSS rescore
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  1. 2026-06-27 03:04 UTCEPSS rescore
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  4. 2026-06-23 21:29 UTCEPSS rescore
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  31. 2026-06-04 13:09 UTCEPSS rescore
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  35. 2026-05-31 22:28 UTCEPSS rescore
  36. 2026-05-31 15:28 UTCEG score recompute
  37. 2026-05-31 15:28 UTCGHSA enrichment
  38. 2026-05-31 00:13 UTCEPSS rescore
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  40. 2026-05-29 13:40 UTCEPSS rescore
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  42. 2026-05-28 13:42 UTCEPSS rescore
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  44. 2026-05-28 13:42 UTCEPSS rescore
  45. 2026-05-27 13:37 UTCEPSS rescore
  46. 2026-05-26 13:41 UTCEPSS rescore
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  48. 2026-05-24 16:42 UTCEPSS rescore
  49. 2026-05-22 21:15 UTCEPSS rescore
  50. 2026-05-21 22:38 UTCEPSS rescore
  51. 2026-05-20 22:36 UTCEPSS rescore
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  53. 2026-05-20 11:20 UTCEPSS rescore
  54. 2026-05-20 11:20 UTCEPSS rescore
  55. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-24325✓ verified
    First seen Jul 27, 2004

    Opera Web Browser 7.53 - Location Replace URI Obfuscation

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2004-2491?
CVE-2004-2491 is a low vulnerability published on December 31, 2004. A race condition in Opera web browser 7.53 Build 3850 causes Opera to fill in the address bar before the page has been loaded, which allows remote attackers to spoof the URL in the address bar via the window.open and location.replace HTML parameters, which facilitates phishing attacks.
When was CVE-2004-2491 disclosed?
CVE-2004-2491 was first published in the National Vulnerability Database on December 31, 2004, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2004-2491 actively exploited?
CVE-2004-2491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.1% of all scored CVEs.
How do I remediate CVE-2004-2491?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2004-2491, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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