arduino-esp32 provides an Arduino core for the ESP32. Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response Splitting vulnerability. The sendHeader function takes arbitrary input for the HTTP header name and value, concatenates them into an HTTP header line, and appends this to the outgoing HTTP response headers. There is no validation or sanitization of the name or value parameters before they are included in the HTTP response. If an attacker can control the input to sendHeader (either directly or indirectly), they could inject carriage return (\r) or line feed (\n) characters into either the header name or value. This could allow the attacker to inject additional headers, manipulate the structure of the HTTP response, potentially inject an entire new HTTP response (HTTP Response Splitting), and/or ause header confusion or other HTTP protocol attacks. Versions 3.3.0-RC1 and 3.2.1 contain a fix for the issue.
CVE-2025-53007
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 8.9 under NVD CVSS v3. EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2025-19198 (ENISA EUVD)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
The CVE record's description, written by its CNA (GitHub, Inc.), states the affected versions: "Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response Splitting vulnerability." No release containing a fix is confirmed on record.
- CVSS v3
- 8.9
- EG Score
- 8.9HIGHmedium confidence
- EG Risk
- 55EG Risk 55/100
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)Severity89% × 45%Impact severity (EG Severity): CVSS 8.9 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.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: No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.5%
- EPSS %ILE
- 40th
- 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 (8.9): severity, escalated by confirmed exploitation. This CVE's 8.9 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.9 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
- 0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.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 low or medium mission impact; Attend at high (mission-essential systems).
No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule 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.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.
The score's inputs: 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 26, 2025
Last Modified
April 15, 2026
Advisory Details (4)
Auto-updated Jul 26, 2026CRLF injection in WebServer.cpp · Advisory · espressif/arduino-esp32 · GitHub
https://github.com/espressif/arduino-esp32/security/advisories/GHSA-5476-9jjq-563mcommit 21640ac82a1b (espressif/arduino-esp32)
Fix landed in espressif/arduino-esp32 commit 21640ac82a1b — awaiting tagged release
https://github.com/espressif/arduino-esp32/commit/21640ac82a1bb5efa8cf0b3841be1ac80add6785arduino-esp32/libraries/WebServer/src/WebServer.cpp at 9e61fa7e4bce59c05cb17c15b11b53b9bafca077 · espressif/arduino-esp32 · GitHub
https://github.com/espressif/arduino-esp32/blob/9e61fa7e4bce59c05cb17c15b11b53b9bafca077/libraries/WebServer/src/WebServer.cpp#L577-L582arduino-esp32/libraries/WebServer/src/WebServer.cpp at 9e61fa7e4bce59c05cb17c15b11b53b9bafca077 · espressif/arduino-esp32 · GitHub
https://github.com/espressif/arduino-esp32/blob/9e61fa7e4bce59c05cb17c15b11b53b9bafca077/libraries/WebServer/src/WebServer.cpp#L504-L521Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 38× 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 95 of 228 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 133 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
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- 2026-10-27 11:34 UTCEG score recompute
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
- 2026-10-25 16:19 UTCEG score recompute
- 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-18 05:27 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
- 2026-10-16 16:39 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-12 16:58 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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- 2026-10-11 20:32 UTCEG score recompute
- 2026-10-11 18:43 UTCEG score recompute
- 2026-10-11 15:19 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
- 2026-10-10 20:33 UTCOSV refresh
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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- 2026-09-21 21:06 UTCEPSS rescoreEPSS 0.4% · 37th percentile
- 2026-09-21 08:19 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
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- 2026-09-02 06:14 UTCOSV refresh
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
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Frequently asked(5)
What is CVE-2025-53007?
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Dependency Blast Radius
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