The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to a server which requests PEAP authentication can be induced to corrupt global static data following the outpacket_buf array, most likely causing incorrect behavior or a crash.
CVE-2026-75883
MEDIUMPre-NVD 6.86.8—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. 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, secondary
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.8
- EG Score
- 6.8(medium)
- EG Risk
- 35(Track)EG Risk 35/100SSVC: Track
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 computedSeverity68% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 17%
- KEV
- Not listed
Published
September 18, 2026
Last Modified
September 18, 2026
Advisory Details (1)
Auto-updated Sep 18, 2026Patch available. Sources: github.
github Patch Available
PPPD buffer overflow in PEAP response code · Advisory · ppp-project/ppp · GitHub
Affected: 2.5.4. PEAP support can be disabled by using the
https://github.com/ppp-project/ppp/security/advisories/GHSA-rwr9-4vx8-vc35Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.
- 2026-09-20 20:16 UTCEPSS rescore
- 2026-09-19 17:34 UTCEG score recompute
- 2026-09-18 16:26 UTCEG score recompute
- 2026-09-18 15:36 UTCEG score recompute
- 2026-09-18 15:34 UTCMITRE cvelistV5first tracked
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Same CWE
10 shownCWE-122
Frequently asked(5)
What is CVE-2026-75883?
CVE-2026-75883 is a medium vulnerability published on September 18, 2026. The code in pppd that formats a response to a PEAP Request packet in peapresponse() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacketbuf without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to…
When was CVE-2026-75883 disclosed?
CVE-2026-75883 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75883 actively exploited?
CVE-2026-75883 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 82.5% of all scored CVEs.
What is the CVSS score of CVE-2026-75883?
CVE-2026-75883 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-75883?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75883, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-75883
Is Your Infrastructure Affected by CVE-2026-75883?
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