CVE-2026-51603

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91) allows an unauthenticated remote attacker to cause a denial of service via a crafted second SETUP request. After completing the OPTIONS, DESCRIBE, and a legitimate first SETUP request to obtain a valid session ID, the RTSP service's second-stage URL routing parser fails to validate the length of the URL field in the subsequent SETUP request. By supplying a URL consisting of exactly four consecutive repetitions of a valid RTSP URL, an attacker can bypass first-stage format validation and trigger a stack buffer overflow, causing an immediate crash of the RTSP service process and rendering the device inaccessible to all clients on the local network.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 10, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

cve_ID_report/Tenda_CP3_V3.0/Tenda_CP3_V3.0_4th/README.md at main · kkkk2222874/cve_ID_report · GitHub

https://github.com/kkkk2222874/cve_ID_report/blob/main/Tenda_CP3_V3.0/Tenda_CP3_V3.0_4th/README.md

Vendor Advisories for CVE-2026-51603(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 111× 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.

Showing the most recent 100 of 169 total refreshes for this CVE.

  1. 2026-08-30 06:59 UTCEG score recompute
  2. 2026-08-30 06:59 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 21:48 UTCEG score recompute
  6. 2026-08-27 21:48 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 01:15 UTCEG score recompute
  9. 2026-08-27 01:15 UTCGHSA enrichment
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-26 03:59 UTCEG score recompute
  12. 2026-08-26 03:59 UTCGHSA enrichment
  13. 2026-08-25 13:49 UTCEPSS rescore
  14. 2026-08-25 07:52 UTCGHSA enrichment
  15. 2026-08-24 20:46 UTCEG score recompute
  16. 2026-08-24 20:46 UTCGHSA enrichment
  17. 2026-08-24 09:40 UTCEG score recompute
  18. 2026-08-24 09:40 UTCGHSA enrichment
  19. 2026-08-23 21:42 UTCGHSA enrichment
  20. 2026-08-23 10:36 UTCEG score recompute
  21. 2026-08-23 10:36 UTCGHSA enrichment
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 23:30 UTCGHSA enrichment
  24. 2026-08-22 12:24 UTCGHSA enrichment
  25. 2026-08-22 01:17 UTCEG score recompute
Show 75 more
  1. 2026-08-22 01:17 UTCGHSA enrichment
  2. 2026-08-21 23:49 UTCEPSS rescore
  3. 2026-08-21 14:10 UTCGHSA enrichment
  4. 2026-08-21 02:26 UTCEG score recompute
  5. 2026-08-21 02:26 UTCGHSA enrichment
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-20 15:20 UTCGHSA enrichment
  8. 2026-08-20 01:53 UTCEG score recompute
  9. 2026-08-20 01:53 UTCGHSA enrichment
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 09:47 UTCGHSA enrichment
  12. 2026-08-18 22:27 UTCEG score recompute
  13. 2026-08-18 22:27 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-18 10:47 UTCGHSA enrichment
  16. 2026-08-17 22:19 UTCEG score recompute
  17. 2026-08-17 22:19 UTCGHSA enrichment
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 07:52 UTCGHSA enrichment
  20. 2026-08-16 20:47 UTCEG score recompute
  21. 2026-08-16 20:47 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 09:40 UTCEG score recompute
  24. 2026-08-16 09:40 UTCGHSA enrichment
  25. 2026-08-16 02:14 UTCEPSS rescore
  26. 2026-08-15 22:35 UTCGHSA enrichment
  27. 2026-08-15 11:29 UTCEG score recompute
  28. 2026-08-15 11:29 UTCGHSA enrichment
  29. 2026-08-15 01:30 UTCEPSS rescore
  30. 2026-08-15 00:22 UTCGHSA enrichment
  31. 2026-08-14 13:16 UTCGHSA enrichment
  32. 2026-08-14 02:10 UTCEG score recompute
  33. 2026-08-14 02:10 UTCGHSA enrichment
  34. 2026-08-13 22:00 UTCEPSS rescore
  35. 2026-08-13 15:04 UTCGHSA enrichment
  36. 2026-08-13 03:58 UTCGHSA enrichment
  37. 2026-08-12 16:53 UTCEG score recompute
  38. 2026-08-12 16:53 UTCGHSA enrichment
  39. 2026-08-12 13:51 UTCEPSS rescore
  40. 2026-08-12 05:47 UTCGHSA enrichment
  41. 2026-08-11 18:24 UTCEG score recompute
  42. 2026-08-11 18:24 UTCGHSA enrichment
  43. 2026-08-11 07:06 UTCEG score recompute
  44. 2026-08-11 07:06 UTCGHSA enrichment
  45. 2026-08-11 00:00 UTCEPSS rescore
  46. 2026-08-10 20:01 UTCGHSA enrichment
  47. 2026-08-10 08:55 UTCGHSA enrichment
  48. 2026-08-09 21:49 UTCEG score recompute
  49. 2026-08-09 21:49 UTCGHSA enrichment
  50. 2026-08-09 13:46 UTCEPSS rescore
  51. 2026-08-09 10:43 UTCGHSA enrichment
  52. 2026-08-08 23:37 UTCEG score recompute
  53. 2026-08-08 23:37 UTCGHSA enrichment
  54. 2026-08-08 16:37 UTCEPSS rescore
  55. 2026-08-08 12:31 UTCGHSA enrichment
  56. 2026-08-08 01:25 UTCEG score recompute
  57. 2026-08-08 01:25 UTCGHSA enrichment
  58. 2026-08-07 14:19 UTCGHSA enrichment
  59. 2026-08-07 03:13 UTCGHSA enrichment
  60. 2026-08-06 16:07 UTCEG score recompute
  61. 2026-08-06 16:07 UTCGHSA enrichment
  62. 2026-08-06 13:47 UTCEPSS rescore
  63. 2026-08-06 04:59 UTCEG score recompute
  64. 2026-08-06 04:59 UTCGHSA enrichment
  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-05 17:53 UTCGHSA enrichment
  67. 2026-08-05 06:47 UTCGHSA enrichment
  68. 2026-08-04 19:40 UTCEG score recompute
  69. 2026-08-04 19:40 UTCGHSA enrichment
  70. 2026-08-04 15:10 UTCEPSS rescore
  71. 2026-08-04 10:39 UTCEPSS rescore
  72. 2026-08-04 08:32 UTCGHSA enrichment
  73. 2026-08-03 21:17 UTCEG score recompute
  74. 2026-08-03 21:17 UTCGHSA enrichment
  75. 2026-08-03 10:36 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51603?
CVE-2026-51603 is a high vulnerability published on July 9, 2026. A stack-based buffer overflow vulnerability in the RTSP service of Tenda CP3 V3.0 (firmware V31.1.9.91) allows an unauthenticated remote attacker to cause a denial of service via a crafted second SETUP request. After completing the OPTIONS, DESCRIBE, and a legitimate first SETUP request to obtain a…
When was CVE-2026-51603 disclosed?
CVE-2026-51603 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51603 actively exploited?
CVE-2026-51603 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.9% of all scored CVEs.
What is the CVSS score of CVE-2026-51603?
CVE-2026-51603 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51603?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51603, 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.

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