CVE-2025-66038

MEDIUMNVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 6.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (21st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2025-209127 (ENISA EUVD)Source: ENISA EUVD

6.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity68% × 45%
Impact severity (EG Severity): CVSS 6.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.8): severity, escalated by confirmed exploitation. This CVE's 6.8 is its impact severity (EG Severity), not escalated.

EG Severity
6.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 30, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 3, 2026
Patch available. Sources: github_commit, github.
Web page

CVE 2025 66038 · OpenSC/OpenSC Wiki · GitHub

https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038
GitHub advisoryMentions a patch (unverified)

`sc_compacttlv_find_tag` can return out-of-bounds pointers · Advisory · OpenSC/OpenSC · GitHub

https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459
GitHub commit

commit 6db171bcb6fd (OpenSC/OpenSC)

Fix landed in OpenSC/OpenSC commit 6db171bcb6fd — awaiting tagged release

https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c

Vendor Advisories for CVE-2025-66038(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
opensc0.21.0-1 ... 0.27.1-2 (23 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
opensc0.23.0-0.3 ... 0.27.1-2 (18 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
opensc0.26.1-2 ... 0.27.1-2 (6 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
opensc0.26.1-2, 0.26.1-3
  • every version up to 0.27.0~rc1-1: fixed in 0.27.0~rc1-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 117 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 21 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  6. 2026-10-25 16:09 UTCEG score recompute
  7. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-23 13:01 UTCEG score recompute
  10. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-18 05:19 UTCEG score recompute
  16. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-10-16 16:39 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-10-12 16:49 UTCEG score recompute
  22. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-10-11 20:23 UTCEG score recompute
  24. 2026-10-11 18:35 UTCEG score recompute
  25. 2026-10-11 15:10 UTCEG score recompute
Show 71 more
  1. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-11 04:01 UTCOSV refresh
  3. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  5. 2026-10-08 17:10 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  6. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  11. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  13. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-09-21 15:49 UTCOSV refresh
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  20. 2026-09-19 15:42 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  21. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  22. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-09-15 03:10 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  27. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  28. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  31. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  33. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  35. 2026-09-02 12:44 UTCOSV refresh
  36. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  37. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  38. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  39. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  40. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  41. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  42. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  43. 2026-08-24 14:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  44. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  45. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  46. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  47. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  49. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  50. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  51. 2026-08-16 09:46 UTCEG score recompute
  52. 2026-08-16 09:46 UTCVendor advisory
  53. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  54. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  55. 2026-08-14 06:09 UTCEG score recompute
  56. 2026-08-14 06:09 UTCVendor advisory
  57. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  58. 2026-08-12 20:29 UTCEG score recompute
  59. 2026-08-12 20:29 UTCVendor advisory
  60. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  61. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  62. 2026-08-11 08:30 UTCEG score recompute
  63. 2026-08-11 08:30 UTCVendor advisory
  64. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  65. 2026-08-10 07:08 UTCEG score recompute
  66. 2026-08-10 07:08 UTCVendor advisory
  67. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  68. 2026-08-09 05:43 UTCEG score recompute
  69. 2026-08-09 05:43 UTCVendor advisory
  70. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  71. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.3% · 20th percentile

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Frequently asked(5)

What is CVE-2025-66038?
CVE-2025-66038 is a medium-severity vulnerability; its CVE record was published on March 30, 2026. OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sccompacttlvfindtag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims…
When was the CVE record for CVE-2025-66038 published?
The CVE record for CVE-2025-66038 was published on March 30, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2025-66038 actively exploited?
CVE-2025-66038 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-66038?
CVE-2025-66038 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2025-66038?
A fix for CVE-2025-66038 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-66038 are linked in the Vendor Advisories panel on this page.

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