CVE-2025-47917

HIGHNVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

Score 8.9 from GitHub Security Advisory (severity: HIGH) published 2025-07-20. NVD baseline CVSS 8.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.9Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtls_x509_string_to_names() takes a head argument that is documented as an output argument. The documentation does not suggest that the function will free that pointer; however, the function does call mbedtls_asn1_free_named_data_list() on that argument, which performs a deep free(). As a result, application code that uses this function (relying only on documented behavior) is likely to still hold pointers to the memory blocks that were freed, resulting in a high risk of use-after-free or double-free. In particular, the two sample programs x509/cert_write and x509/cert_req are affected (use-after-free if the san string contains more than one DN).

CVSS v3
8.9
EG Score
8.9(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity89% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
81%
KEV
Not listed

Published

July 20, 2025

Last Modified

November 3, 2025

Advisory Details (4)

Auto-updated Jul 26, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4274-2] mbedtls security update

https://lists.debian.org/debian-lts-announce/2025/08/msg00025.html
generic Patch Available

[SECURITY] [DLA 4274-1] mbedtls security update

https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html
generic

Security Advisories — Mbed TLS documentation

https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/
generic

mbedtls-docs/security-advisories/mbedtls-security-advisory-2025-06-7.md at main · Mbed-TLS/mbedtls-docs · GitHub

https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-7.md

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibmbedx509-1t64 (2.28.8-1ubuntu0.1~esm1) @ noble2026-05-30ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
mbedtls2.16.9-0.1, 2.16.9-0.1+deb11u1, 2.16.9-0.1+deb11u22.16.9-0.1+deb11u3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
mbedtls2.28.3-1 ... 3.6.7-3 (22 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
mbedtls—3.6.4-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 29× 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 157 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:29 UTCEPSS rescore
  4. 2026-09-16 14:07 UTCEPSS rescore
  5. 2026-09-15 03:09 UTCEPSS rescore
  6. 2026-09-13 06:35 UTCOSV refresh
  7. 2026-09-12 15:00 UTCEPSS rescore
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-11 09:36 UTCEPSS rescore
  10. 2026-09-10 09:34 UTCEPSS rescore
  11. 2026-09-08 21:59 UTCEPSS rescore
  12. 2026-09-07 16:00 UTCEPSS rescore
  13. 2026-09-07 16:00 UTCEPSS rescore
  14. 2026-09-06 13:46 UTCEPSS rescore
  15. 2026-09-05 15:28 UTCEPSS rescore
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-02 14:11 UTCEPSS rescore
  18. 2026-09-01 13:53 UTCEPSS rescore
  19. 2026-09-01 04:38 UTCEPSS rescore
  20. 2026-08-30 19:16 UTCEPSS rescore
  21. 2026-08-30 01:21 UTCEPSS rescore
  22. 2026-08-28 21:40 UTCEPSS rescore
  23. 2026-08-27 14:24 UTCEPSS rescore
  24. 2026-08-26 14:45 UTCEPSS rescore
  25. 2026-08-25 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 07:26 UTCOSV refresh
  2. 2026-08-24 14:16 UTCEPSS rescore
  3. 2026-08-24 09:22 UTCEPSS rescore
  4. 2026-08-23 00:18 UTCEPSS rescore
  5. 2026-08-21 23:48 UTCEPSS rescore
  6. 2026-08-20 22:54 UTCEPSS rescore
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-18 13:47 UTCEPSS rescore
  9. 2026-08-17 13:46 UTCEPSS rescore
  10. 2026-08-16 14:55 UTCEPSS rescore
  11. 2026-08-16 02:13 UTCEPSS rescore
  12. 2026-08-15 01:29 UTCEPSS rescore
  13. 2026-08-13 21:59 UTCEPSS rescore
  14. 2026-08-12 13:50 UTCEPSS rescore
  15. 2026-08-11 13:41 UTCEPSS rescore
  16. 2026-08-10 23:59 UTCEPSS rescore
  17. 2026-08-09 13:46 UTCEPSS rescore
  18. 2026-08-09 01:19 UTCOSV refresh
  19. 2026-08-08 16:36 UTCEPSS rescore
  20. 2026-08-06 13:46 UTCEPSS rescore
  21. 2026-08-05 19:16 UTCEPSS rescore
  22. 2026-08-04 15:09 UTCEPSS rescore
  23. 2026-08-04 10:37 UTCEPSS rescore
  24. 2026-08-03 10:35 UTCEPSS rescore
  25. 2026-08-02 02:26 UTCEPSS rescore
  26. 2026-08-01 04:15 UTCEPSS rescore
  27. 2026-07-30 16:27 UTCEPSS rescore
  28. 2026-07-30 01:30 UTCEPSS rescore
  29. 2026-07-30 01:30 UTCEPSS rescore
  30. 2026-07-28 15:35 UTCEPSS rescore
  31. 2026-07-26 14:54 UTCEPSS rescore
  32. 2026-07-25 14:17 UTCEPSS rescore
  33. 2026-07-25 14:17 UTCEPSS rescore
  34. 2026-07-24 14:17 UTCEPSS rescore
  35. 2026-07-24 00:41 UTCOSV refresh
  36. 2026-07-23 14:18 UTCEPSS rescore
  37. 2026-07-23 02:57 UTCEG score recompute
  38. 2026-07-22 14:07 UTCEPSS rescore
  39. 2026-07-22 14:07 UTCEPSS rescore
  40. 2026-07-21 15:24 UTCEPSS rescore
  41. 2026-07-20 17:07 UTCEPSS rescore
  42. 2026-07-19 14:30 UTCEPSS rescore
  43. 2026-07-19 14:30 UTCEPSS rescore
  44. 2026-07-19 02:28 UTCEPSS rescore
  45. 2026-07-19 02:28 UTCEPSS rescore
  46. 2026-07-18 10:04 UTCEPSS rescore
  47. 2026-07-16 17:02 UTCEPSS rescore
  48. 2026-07-16 17:02 UTCEPSS rescore
  49. 2026-07-15 16:57 UTCEPSS rescore
  50. 2026-07-15 16:57 UTCEPSS rescore
  51. 2026-07-15 01:59 UTCEPSS rescore
  52. 2026-07-15 01:59 UTCEPSS rescore
  53. 2026-07-13 22:29 UTCEPSS rescore
  54. 2026-07-13 22:29 UTCEPSS rescore
  55. 2026-07-13 06:12 UTCEPSS rescore
  56. 2026-07-12 05:46 UTCEPSS rescore
  57. 2026-07-11 08:27 UTCEPSS rescore
  58. 2026-07-11 08:27 UTCEPSS rescore
  59. 2026-07-09 19:09 UTCEPSS rescore
  60. 2026-07-09 19:09 UTCEPSS rescore
  61. 2026-07-08 15:15 UTCEPSS rescore
  62. 2026-07-07 13:45 UTCEPSS rescore
  63. 2026-07-06 18:51 UTCOSV refresh
  64. 2026-07-06 16:27 UTCEPSS rescore
  65. 2026-07-06 16:27 UTCEPSS rescore
  66. 2026-07-06 02:23 UTCEPSS rescore
  67. 2026-07-06 02:23 UTCEPSS rescore
  68. 2026-07-05 02:30 UTCEPSS rescore
  69. 2026-07-04 06:30 UTCEPSS rescore
  70. 2026-07-02 17:01 UTCEPSS rescore
  71. 2026-07-01 15:06 UTCEPSS rescore
  72. 2026-06-30 23:22 UTCEPSS rescore
  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-29 14:06 UTCEPSS rescore
  75. 2026-06-29 14:06 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-52427
    First seen Sep 16, 2025

    Mbed TLS 3.6.4 - Use-After-Free

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-47917?
CVE-2025-47917 is a high vulnerability published on July 20, 2025. Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtlsx509stringtonames() takes a head argument that is documented as an output argument. The documentation does not suggest that the function…
When was CVE-2025-47917 disclosed?
CVE-2025-47917 was first published in the National Vulnerability Database on July 20, 2025, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-47917 actively exploited?
CVE-2025-47917 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 18.7% of all scored CVEs.
What is the CVSS score of CVE-2025-47917?
CVE-2025-47917 has a CVSS v3 base score of 8.9 (NVD).
How do I remediate CVE-2025-47917?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-47917, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-47917

Explore →

Is Your Infrastructure Affected by CVE-2025-47917?

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

Start Free Scan →Browse All CVEs