CVE-2026-49843

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.5% × 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
0.5%
EPSS %ILE
41st
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

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

June 9, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`. · Advisory · signalwire/freeswitch · GitHub

https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m
GitHub release Patch Available

FreeSWITCH v1.11.1 Release

Patch available: signalwire/freeswitch v1.11.1

https://github.com/signalwire/freeswitch/releases/tag/v1.11.1

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 28× 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 100 of 153 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. None are among the latest 100 rows. The 53 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-12 15:59 UTCEG score recompute
  5. 2026-10-11 19:43 UTCEG score recompute
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  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-03 09:39 UTCOSV refresh
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
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  24. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
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  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-09-14 04:36 UTCEG score recompute
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  6. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  7. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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  15. 2026-08-31 00:55 UTCEG score recompute
  16. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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  18. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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  21. 2026-08-25 00:50 UTCEG score recompute
  22. 2026-08-23 11:13 UTCEG score recompute
  23. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-08-21 10:13 UTCEG score recompute
  26. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  27. 2026-08-20 09:09 UTCEG score recompute
  28. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  31. 2026-08-17 00:44 UTCEG score recompute
  32. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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  34. 2026-08-16 00:36 UTCEG score recompute
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  38. 2026-08-12 20:16 UTCEG score recompute
  39. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  40. 2026-08-11 20:29 UTCEG score recompute
  41. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  42. 2026-08-09 19:17 UTCEG score recompute
  43. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  44. 2026-08-08 19:31 UTCEG score recompute
  45. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  46. 2026-08-07 19:44 UTCEG score recompute
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  48. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  49. 2026-08-05 20:11 UTCEG score recompute
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  53. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  54. 2026-08-03 15:01 UTCEG score recompute
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  60. 2026-07-31 10:16 UTCEG score recompute
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  66. 2026-07-28 08:11 UTCEG score recompute
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  68. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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  73. 2026-07-23 03:18 UTCEG score recompute
  74. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  75. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile

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Frequently asked(5)

What is CVE-2026-49843?
CVE-2026-49843 is a medium-severity vulnerability; its CVE record was published on June 9, 2026. FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the…
When was the CVE record for CVE-2026-49843 published?
The CVE record for CVE-2026-49843 was published on June 9, 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 July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-49843 actively exploited?
CVE-2026-49843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49843?
CVE-2026-49843 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-49843?
A fix for CVE-2026-49843 is available: update to the fixed version the vendor names in its advisory.

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