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 heap buffer overflow through an out-of-bounds write in the Codec2 decoder caused by a floor/ceil sample-count mismatch. The codec_codec2 module must be loaded and Codec2 must be configured on the attacked endpoint. The attacker must pass SIP authentication by username/password or source IP address matching, establish a call using Codec2, and send carefully crafted Codec2 audio packets. 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-2026-57192
This medium-severity CVE scores 6.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-111396 (ENISA EUVD)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 6.0
- EG Score
- 6.0MEDIUMlow confidence
- EG Risk
- 27EG Risk 27/100
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)Severity60% × 45%Impact severity (EG Severity): CVSS 6.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0% × 40%No KEV listing, EG-KEV tier or EPSS when EchelonGraph scored this CVE.Automatability0% × 15%CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact partial (CVSS v4.0 confidentiality and integrity impact neither High). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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
- 0.7%
- EPSS %ILE
- 51st
- 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 (6.0): severity, escalated by confirmed exploitation. This CVE's 6.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.0 MEDIUMCVSS-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
- 0.7% 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 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 (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact partial (CVSS v4.0 confidentiality and integrity impact neither High). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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's BOD 26-04 default) · Technical impact partial (CVSS v4.0 confidentiality and integrity impact neither High). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” 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 28, 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 d4ccfd55ffd7 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit d4ccfd55ffd7 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006commit aa40bc599a8e (asterisk/asterisk)
Fix landed in asterisk/asterisk commit aa40bc599a8e — awaiting tagged release
https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0dcommit a2f1cc611f7d (asterisk/asterisk)
Fix landed in asterisk/asterisk commit a2f1cc611f7d — awaiting tagged release
https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434ccommit a0bc717b2261 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit a0bc717b2261 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398commit 9b085d48fb66 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 9b085d48fb66 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acbcommit 4f5cad0611c6 (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 4f5cad0611c6 — awaiting tagged release
https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56commit 02e2d8d51efe (asterisk/asterisk)
Fix landed in asterisk/asterisk commit 02e2d8d51efe — awaiting tagged release
https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 10× 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.
- 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-27 22:28 UTCEG score recompute
- 2026-10-27 22:01 UTCENISA EUVD ID recordedEUVD-2026-111396 · Source: ENISA EUVD
- 2026-10-27 21:35 UTCEG score recomputeFirst assessed: 6.0 MEDIUM
- 2026-10-27 21:35 UTCMITRE cvelistV5first tracked
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Frequently asked(5)
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