CVE-2015-5741

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

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 computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.7%
EPSS %ILE
85th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

February 8, 2020

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Oct 7, 2026
Patch available. Sources: redhat, github_commit.
generic

oss-sec: CVE Request - Go net/http library - HTTP smuggling

http://seclists.org/oss-sec/2015/q3/237
github_commit

commit 300d9a21583e (golang/go)

Fix landed in golang/go commit 300d9a21583e — awaiting tagged release

https://github.com/golang/go/commit/300d9a21583e7cf0149a778a0611e76ff7c6680f
redhatMentions a patch (unverified)

1250352 – (CVE-2015-5739, CVE-2015-5740, CVE-2015-5741) CVE-2015-5739 CVE-2015-5740 CVE-2015-5741 golang: HTTP request smuggling in net/http library

https://bugzilla.redhat.com/show_bug.cgi?id=1250352
generic

oss-sec: Re: CVE Request - Go net/http library - HTTP smuggling

http://seclists.org/oss-sec/2015/q3/294
generic

oss-sec: Re: CVE Request - Go net/http library - HTTP smuggling

http://seclists.org/oss-sec/2015/q3/292

Vendor Advisories for CVE-2015-5741(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatgolang-0:1.6.3-1.el7_2.12016-08-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
stdlib—
  • every version up to 1.4.3: fixed in 1.4.3
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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 145 total refreshes for this CVE.

  1. 2026-10-09 20:01 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2015-5741?
CVE-2015-5741 is a critical vulnerability published on February 8, 2020. The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.
When was CVE-2015-5741 disclosed?
CVE-2015-5741 was first published on February 8, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-5741 actively exploited?
CVE-2015-5741 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.7% probability of exploitation in the next 30 days (85th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2015-5741?
CVE-2015-5741 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-5741?
A fix for CVE-2015-5741 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2015-5741 are linked in the Vendor Advisories panel on this page.

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