Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated attacker may cause a stack buffer overflow in res_xmpp XMPP namespace prefix handling using carefully crafted packets. The res_xmpp module must be loaded, an XMPP connection must be configured in xmpp.conf, and the attacker must have an XMPP account on the same or a federated server. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.
CVE-2026-57188
“—” beside the score: it is equal to the CVSS score beside it.
This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-111344 (ENISA EUVD)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.1
- EG Score
- 7.1HIGHmedium confidence
- EG Risk
- 32EG Risk 32/100
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)Severity71% × 45%Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.5% × 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
- 0.5%
- EPSS %ILE
- 44th
- 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 (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). 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
October 27, 2026
Last Modified
October 30, 2026
Advisory Details (10)
Auto-updated Oct 28, 2026Asterisk Release 22.10.1
Patch available: asterisk/asterisk 22.10.1
https://github.com/asterisk/asterisk/releases/tag/22.10.1Asterisk Release 21.12.3
Patch available: asterisk/asterisk 21.12.3
https://github.com/asterisk/asterisk/releases/tag/21.12.3Asterisk Release 20.20.1
Patch available: asterisk/asterisk 20.20.1
https://github.com/asterisk/asterisk/releases/tag/20.20.1commit e329a6803ac5 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit e329a6803ac5 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08commit d570a85e4515 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit d570a85e4515 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1commit 5e626250628b (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 5e626250628b — awaiting tagged release
https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873bcommit 433102c16b8e (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 433102c16b8e — awaiting tagged release
https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923commit 3c4b08cf94ee (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 3c4b08cf94ee — awaiting tagged release
https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13commit 1328dbb503da (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 1328dbb503da — awaiting tagged release
https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84commit 12072a559f59 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 12072a559f59 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 11× 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.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-30 21:26 UTCEG score recompute
- 2026-10-30 20:29 UTCEG score recompute
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-27 19:01 UTCENISA EUVD ID recordedEUVD-2026-111344 · Source: ENISA EUVD
- 2026-10-27 18:27 UTCEG score recompute
- 2026-10-27 18:06 UTCEG score recomputeFirst assessed: 7.1 HIGH
- 2026-10-27 18:04 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
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