ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a vulnerability exists in the WPS (Wi-Fi Protected Setup) Enrollee implementation where malformed EAP-WSC packets with truncated payloads can cause integer underflow during fragment length calculation. When processing EAP-Expanded (WSC) messages, the code computes frag_len by subtracting header sizes from the total packet length. If an attacker sends a packet where the EAP Length field covers only the header and flags but omits the expected payload (such as the 2-byte Message Length field when WPS_MSG_FLAG_LEN is set), frag_len becomes negative. This negative value is then implicitly cast to size_t when passed to wpabuf_put_data(), resulting in a very large unsigned value. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.
CVE-2026-25532
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 8.0 under NVD CVSS v3. EPSS exploit probability: 0.2% (16th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-5376 (ENISA EUVD)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
The CVE record names the fixed release — apply it.
- CVSS v3
- 8.0
- EG Score
- 8.0HIGHmedium confidence
- EG Risk
- 36EG Risk 36/100
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)Severity80% × 45%Impact severity (EG Severity): CVSS 8.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.2% × 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: The CVE record names the fixed release. Apply it within your standard update timelines. - EPSS PROB
- 0.2%
- EPSS %ILE
- 16th
- 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 (8.0): severity, escalated by confirmed exploitation. This CVE's 8.0 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.0 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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.
The CVE record names the fixed release. 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
February 4, 2026
Last Modified
June 17, 2026
Advisory Details (8)
Auto-updated Aug 2, 2026WPS Enrollee Fragment Integer Underflow Vulnerability · Advisory · espressif/esp-idf · GitHub
https://github.com/espressif/esp-idf/security/advisories/GHSA-m2h2-683f-9mw7commit de28801e8ea6 (espressif/esp-idf)
Fix landed in espressif/esp-idf commit de28801e8ea6 — awaiting tagged release
https://github.com/espressif/esp-idf/commit/de28801e8ea6a736b6f0db6fc0c682739363bb41commit cad36beb4cde (espressif/esp-idf)
Fix landed in espressif/esp-idf commit cad36beb4cde — awaiting tagged release
https://github.com/espressif/esp-idf/commit/cad36beb4cde27abcf316cd90d8d8dddbc6f213acommit b88befde6b5a (espressif/esp-idf)
Fix landed in espressif/esp-idf commit b88befde6b5a — awaiting tagged release
https://github.com/espressif/esp-idf/commit/b88befde6b5addcdd8d7373ce55c8052dea1e855commit b209fae993d7 (espressif/esp-idf)
Fix landed in espressif/esp-idf commit b209fae993d7 — awaiting tagged release
https://github.com/espressif/esp-idf/commit/b209fae993d795255827ce6b2b0d6942a377f5d4commit 73a587d42a57 (espressif/esp-idf)
Fix landed in espressif/esp-idf commit 73a587d42a57 — awaiting tagged release
https://github.com/espressif/esp-idf/commit/73a587d42a57ece1962b6a4c530b574600650f63commit 6f6766f917bc (espressif/esp-idf)
Fix landed in espressif/esp-idf commit 6f6766f917bc — awaiting tagged release
https://github.com/espressif/esp-idf/commit/6f6766f917bc940ffbcc97eac4765a6ab15d5f79commit 60f992a26de1 (espressif/esp-idf)
Fix landed in espressif/esp-idf commit 60f992a26de1 — awaiting tagged release
https://github.com/espressif/esp-idf/commit/60f992a26de17bb5406f2149a2f8282dd7ad1c59Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 40× 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 99 of 204 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 105 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-11-01 19:36 UTCEG score recompute
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 16th percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
- 2026-10-25 14:40 UTCEG score recompute
- 2026-10-25 06:11 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-18 03:52 UTCEG score recompute
- 2026-10-17 16:45 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
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- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-12 16:19 UTCEG score recompute
- 2026-10-11 20:01 UTCEG score recompute
- 2026-10-11 17:14 UTCEG score recompute
- 2026-10-11 14:46 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-09 10:55 UTCOSV refresh
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 26th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 26th percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 26th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 26th percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 26th percentile
- 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.4% · 26th percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-19 18:03 UTCOSV refresh
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-31 21:34 UTCOSV refresh
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-14 11:12 UTCEG score recompute
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-13 03:31 UTCEG score recompute
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-09 15:51 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-07 22:46 UTCEG score recompute
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-06 04:22 UTCEG score recompute
- 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-02 21:25 UTCEG score recompute▲ 1.70
- 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-07-30 23:21 UTCOSV refresh
- 2026-07-30 16:27 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
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Frequently asked(5)
What is CVE-2026-25532?
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