CVE-2023-41378

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.7% (52nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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

Published

November 6, 2023

Last Modified

June 17, 2026

References (3)

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/projectcalico/calico—
  • 3.26.0 up to 3.26.3: fixed in 3.26.3
  • every version through 3.25.1: no fix on record
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 27× 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 80 of 180 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. 20 repeat rows among the latest 100 are merged into the row they repeat. The 100 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  6. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  7. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  9. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  10. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-09-30 16:29 UTCEG score recompute
  12. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  13. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  15. 2026-09-27 13:42 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  16. 2026-09-26 15:56 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  18. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  19. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-09-22 17:38 UTCOSV refresh
  21. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  22. 2026-09-18 19:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-09-17 19:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  24. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  25. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
Show 55 more
  1. 2026-09-13 16:44 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  3. 2026-09-11 14:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  6. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  7. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-09-05 15:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  9. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-09-03 13:59 UTCOSV refresh
  12. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-08-30 01:20 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  19. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  22. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-08-17 13:45 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  26. 2026-08-17 03:23 UTCOSV refresh
  27. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  28. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  29. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  30. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  31. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  32. 2026-08-11 13:39 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  33. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  34. 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  35. 2026-08-07 16:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  36. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  37. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  38. 2026-08-04 15:07 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  39. 2026-08-03 10:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  40. 2026-08-02 02:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  41. 2026-08-01 22:06 UTCOSV refresh
  42. 2026-08-01 04:13 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  43. 2026-07-30 16:26 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  44. 2026-07-30 01:28 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  45. 2026-07-28 15:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  46. 2026-07-26 14:52 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  47. 2026-07-25 14:16 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  48. 2026-07-24 14:16 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  49. 2026-07-23 14:16 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  50. 2026-07-23 02:26 UTCEG score recompute
  51. 2026-07-22 23:12 UTCEG score recompute
  52. 2026-07-22 14:06 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  53. 2026-07-21 15:23 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  54. 2026-07-20 17:06 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  55. 2026-07-19 14:29 UTCEPSS rescoreEPSS 0.7% · 49th percentile

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Frequently asked(5)

What is CVE-2023-41378?
CVE-2023-41378 is a high-severity vulnerability; its CVE record was published on November 6, 2023. In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server…
When was CVE-2023-41378 made public?
CVE-2023-41378 was made public on November 6, 2023: that is the date its CVE record's CNA, Tigera, Inc., gives for when the vulnerability was made public. The CVE record itself was published on November 6, 2023. 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-2023-41378 actively exploited?
CVE-2023-41378 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-41378?
CVE-2023-41378 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-41378?
A fix for CVE-2023-41378 is available: update to the fixed version the vendor names in its advisory.

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