CVE-2025-5351

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.6% (49th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 4.2 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2025-07-04) is not newer than that change (2026-09-01), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2025-19935 (ENISA EUVD) · GHSA-pfqf-mv4p-9j4r (GitHub Security Advisories)Source: ENISA EUVD

6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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
0.6%
EPSS %ILE
49th
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 (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 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
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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 every mission impact level.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, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (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.

The score's inputs: 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

July 4, 2025

Last Modified

September 1, 2026

Advisory Details (3)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
Red HatMentions a patch (unverified)

2369367 – (CVE-2025-5351) CVE-2025-5351 libssh: Double Free Vulnerability in libssh Key Export Functions

Affected: Red Hat Enterprise Linux 9

https://bugzilla.redhat.com/show_bug.cgi?id=2369367
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2025-5351
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:18683

Vendor Advisories for CVE-2025-5351(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibssh-doc (0.11.1-1ubuntu0.1) @ plucky2026-10-23ubuntu
redhatlibssh-0:0.10.4-18.el92026-05-19redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libssh0.10.5-2, 0.10.5-3, 0.10.5-3+hurd.1, 0.10.6-0+deb12u1
  • every version up to 0.10.6-0+deb12u2: fixed in 0.10.6-0+deb12u2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libssh—
  • every version up to 0.11.2-1: fixed in 0.11.2-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libssh—
  • every version up to 0.11.2-1: fixed in 0.11.2-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 41× 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 97 of 246 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 149 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-11-01 01:55 UTCOSV refresh
  4. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  6. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  7. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  8. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-10-25 16:19 UTCEG score recompute
  12. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-23 17:19 UTCEG score recompute
  14. 2026-10-23 17:19 UTCVendor advisory
  15. 2026-10-23 17:19 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  16. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  20. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-10-18 05:27 UTCEG score recompute
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  24. 2026-10-16 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  25. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
Show 72 more
  1. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-10-12 16:57 UTCEG score recompute
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-10-11 20:31 UTCEG score recompute
  6. 2026-10-11 18:43 UTCEG score recompute
  7. 2026-10-11 15:18 UTCEG score recompute
  8. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-10-10 00:55 UTCOSV refresh
  11. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-10-08 17:10 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  19. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  21. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-09-20 09:03 UTCOSV refresh
  26. 2026-09-19 15:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  27. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  28. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  29. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  30. 2026-09-15 03:10 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  31. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  32. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  33. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  34. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  35. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  36. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  37. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  38. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  39. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  40. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  41. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  42. 2026-09-01 12:32 UTCVendor advisory
  43. 2026-09-01 12:32 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  44. 2026-09-01 11:57 UTCEG score recompute
  45. 2026-09-01 11:57 UTCVendor advisory
  46. 2026-09-01 11:57 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  47. 2026-08-31 16:43 UTCVendor advisory
  48. 2026-08-31 16:43 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  49. 2026-08-31 15:09 UTCEG score recompute
  50. 2026-08-31 15:09 UTCVendor advisory
  51. 2026-08-31 15:09 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  52. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  53. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  54. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  55. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  56. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  57. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  58. 2026-08-24 14:16 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  59. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  60. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  61. 2026-08-21 13:24 UTCVendor advisory
  62. 2026-08-21 13:24 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  63. 2026-08-21 12:51 UTCEG score recompute
  64. 2026-08-21 12:51 UTCVendor advisory
  65. 2026-08-21 12:51 UTCGHSA enrichmentGHSA-pfqf-mv4p-9j4r · GitHub CVSS 4.2
  66. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  67. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  68. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  69. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  70. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  71. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  72. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.5% · 42nd percentile

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Frequently asked(5)

What is CVE-2025-5351?
CVE-2025-5351 is a medium-severity vulnerability; its CVE record was published on July 4, 2025. A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional…
When was CVE-2025-5351 made public?
CVE-2025-5351 was made public on June 24, 2025: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 4, 2025. EchelonGraph's copy of the record carries a last-modified date of September 1, 2026; the record at its source may have been updated since.
Is CVE-2025-5351 actively exploited?
CVE-2025-5351 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-5351?
CVE-2025-5351 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2025-5351?
A fix for CVE-2025-5351 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-5351 are linked in the Vendor Advisories panel on this page.

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