CVE-2018-19518

CRITICALNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 95% probability of exploitation within the next 30 days (top 0.1% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 95%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 95%CVSS: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

A fix is available — apply it.

University of Washington IMAP Toolkit 2007f on UNIX, as used in imap_open() in PHP and other products, launches an rsh command (by means of the imap_rimap function in c-client/imap4r1.c and the tcp_aopen function in osdep/unix/tcp_unix.c) without preventing argument injection, which might allow remote attackers to execute arbitrary OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics. For example, if rsh is a link to ssh (as seen on Debian and Ubuntu systems), then the attack can use an IMAP server name containing a "-oProxyCommand" argument.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
83(Track)
EG Risk 83/100SSVC: 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
Severity90% × 45%
Exploitation95% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
95%
EPSS %ILE
100%
KEV
Not listed

Published

November 25, 2018

Last Modified

November 21, 2024

References (40)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuuw-mailutils (8:2007f~dfsg-4+deb8u1build0.16.04.1) @ xenial2026-05-28ubuntu

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

(6 across 4 ecosystems)
Debian:8(2)
PackageVulnerable rangeFixed inDependents
php55.6.11+dfsg-1 ... 5.6.9+dfsg-1 (44 versions)5.6.39+dfsg-0+deb8u1—
uw-imap8:2007f~dfsg-48:2007f~dfsg-4+deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
php7.07.0.19-1 ... 7.0.32-1 (17 versions)7.0.33-0+deb9u1—
uw-imap8:2007f~dfsg-58:2007f~dfsg-5+deb9u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
uw-imap—8:2007f~dfsg-6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
uw-imap—8:2007f~dfsg-6—

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 1× in last 7d / 8× 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. 2026-09-16 05:06 UTCEPSS rescore
  2. 2026-09-08 21:34 UTCOSV refresh
  3. 2026-09-06 13:43 UTCEPSS rescore
  4. 2026-09-05 15:24 UTCEPSS rescore
  5. 2026-08-28 21:36 UTCEPSS rescore
  6. 2026-08-26 14:42 UTCEPSS rescore
  7. 2026-08-25 13:44 UTCEPSS rescore
  8. 2026-08-22 06:37 UTCOSV refresh
  9. 2026-08-16 02:10 UTCEPSS rescore
  10. 2026-08-12 13:46 UTCEPSS rescore
  11. 2026-08-06 09:40 UTCOSV refresh
  12. 2026-07-26 14:51 UTCEPSS rescore
  13. 2026-07-26 14:51 UTCEPSS rescore
  14. 2026-07-23 01:35 UTCEG score recompute
  15. 2026-07-22 22:15 UTCEG score recompute
  16. 2026-07-21 02:47 UTCOSV refresh
  17. 2026-07-07 13:42 UTCEPSS rescore
  18. 2026-07-07 13:42 UTCEPSS rescore
  19. 2026-07-05 02:27 UTCEPSS rescore
  20. 2026-07-03 21:56 UTCOSV refresh
  21. 2026-06-24 14:02 UTCEPSS rescore
  22. 2026-06-24 14:02 UTCEPSS rescore
  23. 2026-06-23 21:30 UTCEPSS rescore
  24. 2026-06-23 21:30 UTCEPSS rescore
  25. 2026-06-23 21:30 UTCEPSS rescore
Show 24 more
  1. 2026-06-18 17:50 UTCEPSS rescore
  2. 2026-06-18 17:50 UTCEPSS rescore
  3. 2026-06-15 17:45 UTCEPSS rescore
  4. 2026-06-15 09:43 UTCOSV refresh
  5. 2026-06-11 13:57 UTCEPSS rescore
  6. 2026-06-10 13:19 UTCEPSS rescore
  7. 2026-06-06 13:45 UTCEPSS rescore
  8. 2026-06-06 13:45 UTCEPSS rescore
  9. 2026-06-05 22:45 UTCEPSS rescore
  10. 2026-06-05 22:45 UTCEPSS rescore
  11. 2026-06-02 20:11 UTCEPSS rescore
  12. 2026-06-02 20:11 UTCEPSS rescore
  13. 2026-06-01 13:50 UTCEPSS rescore
  14. 2026-06-01 13:50 UTCEPSS rescore
  15. 2026-05-31 22:29 UTCEPSS rescore
  16. 2026-05-29 13:41 UTCEPSS rescore
  17. 2026-05-28 00:55 UTCEG score recompute
  18. 2026-05-28 00:55 UTCVendor advisory
  19. 2026-05-28 00:55 UTCGHSA enrichment
  20. 2026-05-27 13:38 UTCEPSS rescore
  21. 2026-05-27 13:38 UTCEPSS rescore
  22. 2026-05-26 07:17 UTCEPSS rescore
  23. 2026-05-26 07:17 UTCEPSS rescore
  24. 2026-05-24 08:06 UTCOSV refresh

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoChouqe/EXP_CVE-2018-19518
    First seen Apr 15, 2023
    Open source ↗
  • Exploit-DBEDB-45914✓ verified
    First seen Nov 29, 2018

    PHP imap_open - Remote Code Execution (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/http/php_imap_open_rce✓ verified
    First seen Oct 23, 2018

    php imap_open Remote Code Execution

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-19518?
CVE-2018-19518 is a critical vulnerability published on November 25, 2018. University of Washington IMAP Toolkit 2007f on UNIX, as used in imapopen() in PHP and other products, launches an rsh command (by means of the imaprimap function in c-client/imap4r1.c and the tcpaopen function in osdep/unix/tcpunix.c) without preventing argument injection, which might allow remote…
When was CVE-2018-19518 disclosed?
CVE-2018-19518 was first published in the National Vulnerability Database on November 25, 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-2018-19518 actively exploited?
CVE-2018-19518 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95% probability of exploitation in the next 30 days, which ranks it in the top 0.1% of all scored CVEs.
What is the CVSS score of CVE-2018-19518?
CVE-2018-19518 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2018-19518?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-19518, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-19518

Explore →

Is Your Infrastructure Affected by CVE-2018-19518?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs