CVE-2025-13476

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-05. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and predictable TLS ClientHello fingerprint lacking extension diversity, allowing Deep Packet Inspection (DPI) systems to trivially identify and block proxy traffic, undermining censorship circumvention. (CWE-327)

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

March 5, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
No patch confirmed yet. Sources: cert.
cert

VU#772695 - A flawed TLS handshake implementation affects Viber Proxy in multiple platforms

https://www.kb.cert.org/vuls/id/772695
generic

Download | Viber

https://www.viber.com/en/download/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 26× 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. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-16 14:06 UTCEPSS rescore
  3. 2026-09-16 05:13 UTCEPSS rescore
  4. 2026-09-15 03:08 UTCEPSS rescore
  5. 2026-09-13 16:45 UTCEPSS rescore
  6. 2026-09-12 14:59 UTCEPSS rescore
  7. 2026-09-11 14:51 UTCEPSS rescore
  8. 2026-09-11 09:35 UTCEPSS rescore
  9. 2026-09-10 09:33 UTCEPSS rescore
  10. 2026-09-08 21:59 UTCEPSS rescore
  11. 2026-09-07 16:00 UTCEPSS rescore
  12. 2026-09-06 13:46 UTCEPSS rescore
  13. 2026-09-04 13:59 UTCEPSS rescore
  14. 2026-09-04 05:05 UTCEPSS rescore
  15. 2026-09-02 14:10 UTCEPSS rescore
  16. 2026-09-01 13:52 UTCEPSS rescore
  17. 2026-09-01 04:38 UTCEPSS rescore
  18. 2026-08-30 19:16 UTCEPSS rescore
  19. 2026-08-30 01:21 UTCEPSS rescore
  20. 2026-08-28 21:40 UTCEPSS rescore
  21. 2026-08-27 14:24 UTCEPSS rescore
  22. 2026-08-26 14:45 UTCEPSS rescore
  23. 2026-08-25 13:47 UTCEPSS rescore
  24. 2026-08-24 14:15 UTCEPSS rescore
  25. 2026-08-23 00:18 UTCEPSS rescore
Show 70 more
  1. 2026-08-21 23:48 UTCEPSS rescore
  2. 2026-08-20 22:54 UTCEPSS rescore
  3. 2026-08-19 17:02 UTCEPSS rescore
  4. 2026-08-18 13:47 UTCEPSS rescore
  5. 2026-08-17 13:46 UTCEPSS rescore
  6. 2026-08-16 14:55 UTCEPSS rescore
  7. 2026-08-16 12:25 UTCEG score recompute
  8. 2026-08-16 12:25 UTCGHSA enrichment
  9. 2026-08-16 02:13 UTCEPSS rescore
  10. 2026-08-16 02:13 UTCEPSS rescore
  11. 2026-08-15 01:29 UTCEPSS rescore
  12. 2026-08-15 00:33 UTCGHSA enrichment
  13. 2026-08-14 20:49 UTCGHSA enrichment
  14. 2026-08-14 15:52 UTCGHSA enrichment
  15. 2026-08-14 12:07 UTCGHSA enrichment
  16. 2026-08-14 08:23 UTCEG score recompute
  17. 2026-08-14 08:23 UTCGHSA enrichment
  18. 2026-08-13 21:59 UTCEPSS rescore
  19. 2026-08-13 03:42 UTCGHSA enrichment
  20. 2026-08-12 23:58 UTCEG score recompute
  21. 2026-08-12 23:58 UTCGHSA enrichment
  22. 2026-08-12 13:49 UTCEPSS rescore
  23. 2026-08-11 22:59 UTCEG score recompute
  24. 2026-08-11 22:59 UTCGHSA enrichment
  25. 2026-08-11 13:41 UTCEPSS rescore
  26. 2026-08-11 09:14 UTCGHSA enrichment
  27. 2026-08-11 05:29 UTCEG score recompute
  28. 2026-08-11 05:29 UTCGHSA enrichment
  29. 2026-08-10 23:59 UTCEPSS rescore
  30. 2026-08-10 13:01 UTCGHSA enrichment
  31. 2026-08-10 08:21 UTCGHSA enrichment
  32. 2026-08-10 04:37 UTCGHSA enrichment
  33. 2026-08-10 00:53 UTCGHSA enrichment
  34. 2026-08-09 21:09 UTCGHSA enrichment
  35. 2026-08-09 17:25 UTCEG score recompute
  36. 2026-08-09 17:25 UTCGHSA enrichment
  37. 2026-08-09 13:45 UTCEPSS rescore
  38. 2026-08-09 13:36 UTCGHSA enrichment
  39. 2026-08-09 08:02 UTCEG score recompute
  40. 2026-08-09 08:02 UTCGHSA enrichment
  41. 2026-08-08 11:29 UTCGHSA enrichment
  42. 2026-08-08 06:56 UTCGHSA enrichment
  43. 2026-08-08 03:12 UTCGHSA enrichment
  44. 2026-08-07 23:26 UTCGHSA enrichment
  45. 2026-08-07 19:42 UTCEG score recompute
  46. 2026-08-07 19:42 UTCGHSA enrichment
  47. 2026-08-07 16:26 UTCEPSS rescore
  48. 2026-08-06 13:45 UTCEPSS rescore
  49. 2026-08-06 06:15 UTCGHSA enrichment
  50. 2026-08-06 02:31 UTCEG score recompute
  51. 2026-08-06 02:31 UTCGHSA enrichment
  52. 2026-08-05 19:16 UTCEPSS rescore
  53. 2026-08-04 15:09 UTCEPSS rescore
  54. 2026-08-04 10:37 UTCEPSS rescore
  55. 2026-08-04 05:55 UTCGHSA enrichment
  56. 2026-08-04 02:11 UTCEG score recompute
  57. 2026-08-04 02:11 UTCGHSA enrichment
  58. 2026-08-03 10:35 UTCEPSS rescore
  59. 2026-08-03 02:28 UTCGHSA enrichment
  60. 2026-08-02 22:28 UTCGHSA enrichment
  61. 2026-08-02 18:43 UTCEG score recompute
  62. 2026-08-02 18:43 UTCGHSA enrichment
  63. 2026-08-02 02:25 UTCEPSS rescore
  64. 2026-08-01 04:14 UTCEPSS rescore
  65. 2026-07-30 16:26 UTCEPSS rescore
  66. 2026-07-30 01:29 UTCEPSS rescore
  67. 2026-07-28 15:35 UTCEPSS rescore
  68. 2026-07-27 14:12 UTCEPSS rescore
  69. 2026-07-27 13:51 UTCEG score recompute
  70. 2026-07-27 13:51 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2025-13476?
CVE-2025-13476 is a critical vulnerability published on March 5, 2026. Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and predictable TLS ClientHello fingerprint lacking extension diversity, allowing Deep Packet Inspection (DPI) systems to trivially identify and block proxy traffic, undermining censorship circumvention.…
When was CVE-2025-13476 disclosed?
CVE-2025-13476 was first published in the National Vulnerability Database on March 5, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-13476 actively exploited?
CVE-2025-13476 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.9% of all scored CVEs.
What is the CVSS score of CVE-2025-13476?
CVE-2025-13476 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-13476?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-13476, 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

Explore the affected products and dependency analysis for CVE-2025-13476

Explore →

Is Your Infrastructure Affected by CVE-2025-13476?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs