CVE-2018-0500

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: 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 computed
Severity98% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

July 11, 2018

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Jun 5, 2026
Patch available. Sources: redhat, github_commit.
github_commit

commit ba1dbd78e5f1 (curl/curl)

Fix landed in curl/curl commit ba1dbd78e5f1 — awaiting tagged release

https://github.com/curl/curl/commit/ba1dbd78e5f1ed67c1b8d37ac89d90e5e330b628
generic

curl - SMTP send heap buffer overflow - CVE-2018-0500

https://curl.haxx.se/docs/adv_2018-70a2.html
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:2486
generic
http://www.securitytracker.com/id/1041280
generic

cURL: Heap-based buffer overflow (GLSA 201807-04) — Gentoo security

https://security.gentoo.org/glsa/201807-04

Vendor Advisories for CVE-2018-0500(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.58.0-2ubuntu3.2) @ bionic2026-05-28ubuntu
redhatpatch2018-08-16redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 42× 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.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:31 UTCEG score recompute
  3. 2026-07-22 22:11 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
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  6. 2026-07-21 08:47 UTCOSV refresh
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  1. 2026-07-07 13:42 UTCEPSS rescore
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  9. 2026-07-04 04:26 UTCOSV refresh
  10. 2026-07-02 16:54 UTCEPSS rescore
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  34. 2026-06-15 16:13 UTCOSV refresh
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  43. 2026-06-10 13:19 UTCEPSS rescore
  44. 2026-06-08 14:14 UTCEPSS rescore
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  66. 2026-05-28 05:21 UTCEG score recompute
  67. 2026-05-28 05:21 UTCVendor advisory
  68. 2026-05-28 05:21 UTCGHSA enrichment
  69. 2026-05-27 13:38 UTCEPSS rescore
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  71. 2026-05-26 13:42 UTCEPSS rescore
  72. 2026-05-25 15:46 UTCOSV refresh

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-0500?
CVE-2018-0500 is a critical vulnerability published on July 11, 2018. Curlsmtpescapeeob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPTBUFFERSIZE…
When was CVE-2018-0500 disclosed?
CVE-2018-0500 was first published in the National Vulnerability Database on July 11, 2018, 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-2018-0500 actively exploited?
CVE-2018-0500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.0% of all scored CVEs.
What is the CVSS score of CVE-2018-0500?
CVE-2018-0500 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-0500?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0500, 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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