CVE-2025-31135

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 76% 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, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
27.8%
KEV
Not listed

Published

April 1, 2025

Last Modified

April 15, 2026

References (2)

Vendor Advisories for CVE-2025-31135(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/phires/go-guerrilla—1.6.7—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 47× 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.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-10 15:11 UTCOSV refresh
  6. 2026-07-09 19:09 UTCEPSS rescore
  7. 2026-07-08 15:14 UTCEPSS rescore
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  24. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-24 14:04 UTCEPSS rescore
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  3. 2026-06-23 21:32 UTCEPSS rescore
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  5. 2026-06-22 14:25 UTCEPSS rescore
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  7. 2026-06-21 23:24 UTCOSV refresh
  8. 2026-06-21 14:56 UTCEPSS rescore
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  10. 2026-06-21 01:59 UTCEPSS rescore
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  12. 2026-06-19 19:25 UTCEPSS rescore
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  18. 2026-06-15 17:48 UTCEPSS rescore
  19. 2026-06-14 23:17 UTCEPSS rescore
  20. 2026-06-13 23:00 UTCEPSS rescore
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  22. 2026-06-12 23:11 UTCEPSS rescore
  23. 2026-06-11 13:59 UTCEPSS rescore
  24. 2026-06-10 22:18 UTCEPSS rescore
  25. 2026-06-10 13:22 UTCEPSS rescore
  26. 2026-06-08 14:16 UTCEPSS rescore
  27. 2026-06-08 14:16 UTCEPSS rescore
  28. 2026-06-07 15:24 UTCEPSS rescore
  29. 2026-06-07 15:24 UTCEPSS rescore
  30. 2026-06-06 13:47 UTCEPSS rescore
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  32. 2026-06-05 22:46 UTCEPSS rescore
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  34. 2026-06-04 13:12 UTCEPSS rescore
  35. 2026-06-04 13:11 UTCEPSS rescore
  36. 2026-06-03 12:40 UTCOSV refresh
  37. 2026-06-02 20:12 UTCEPSS rescore
  38. 2026-06-01 13:51 UTCEPSS rescore
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  40. 2026-05-31 22:30 UTCEPSS rescore
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  42. 2026-05-31 00:16 UTCEPSS rescore
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  44. 2026-05-29 13:44 UTCEPSS rescore
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  49. 2026-05-27 13:40 UTCEPSS rescore
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  62. 2026-05-23 15:20 UTCEPSS rescore
  63. 2026-05-23 00:09 UTCEG score recompute
  64. 2026-05-22 21:16 UTCEPSS rescore
  65. 2026-05-22 21:16 UTCEPSS rescore
  66. 2026-05-21 22:42 UTCEPSS rescore
  67. 2026-05-21 15:33 UTCEG score recompute
  68. 2026-05-21 07:36 UTCOSV refresh
  69. 2026-05-20 22:37 UTCEPSS rescore
  70. 2026-05-20 22:37 UTCEPSS rescore
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  74. 2026-05-20 22:37 UTCEPSS rescore
  75. 2026-05-20 11:21 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-31135?
CVE-2025-31135 is a medium vulnerability published on April 1, 2025. Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is…
When was CVE-2025-31135 disclosed?
CVE-2025-31135 was first published in the National Vulnerability Database on April 1, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-31135 actively exploited?
CVE-2025-31135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-31135?
CVE-2025-31135 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2025-31135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-31135, 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.

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