VulnSocial

CVE-2018-19518Active Exploitation(canonical / debian_linux)

MEDIUMCVSS 7.5 · HIGH

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

  • Prioritize remediation for canonical debian_linux systems immediately
  • Assume compromise if assets are exposed
  • Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD description

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OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics.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.

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4.5/ 10 priority

Sources & remediation

Exploit / PoC references
Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-88

Priority

MEDIUM

Exploitation

ACTIVE

PoC

YES

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • debian_linux
  • php
  • ubuntu_linux
  • uw-imap

Threat summary

  • Active exploitation appears in 1 classified signals
  • 1 mentions across 1 observed day

What's happening

  • Active exploitation reported across 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
canonicaldebianphpuw-imap_project
Products
debian_linuxphpubuntu_linuxuw-imap

6 versions affected across 4 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-28: 1Active Exploitation · 2026-08-28: 1Technical Details · 2026-08-28: 108-28
Signal classification1 categories
Active Exploitation
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Aviatrix Threat Research Center@aviatrixtrc
    Active Exploitation

    Attackers exploited critical PHP vulnerabilities (CVE-2018-19518, CVE-2019-11043) in internet-exposed Fuel-Boss industrial control systems to achieve remote code execution and privilege escalation. Post-compromise lateral movement across industrial network segments demonstrates how ICS breaches can expand beyond initial systems. Runtime segmentation limits blast radius in these environments. #CloudSecurity :link: Full TRC analysis: https://aviatrix.ai/threat-research-center/all-line-equipment-fuel-boss-cve-2018-19518-cve-2019-11043-2026

    Post summary

    Report confirms attackers actively exploited CVE‑2018‑19518 and CVE‑2019‑11043 on Fuel‑Boss industrial control systems, achieving remote code execution and privilege escalation.

    0000048
    2.0K followersView on X
CPE platform detail7 entries

7 of 7 entries

PartVendorProductVersionTarget SWTarget HW
OScanonicalubuntu_linux16.04--
OScanonicalubuntu_linux18.04--
OScanonicalubuntu_linux19.04--
OSdebiandebian_linux8.0--
OSdebiandebian_linux9.0--
Appphpphp---
Appuw-imap_projectuw-imap2007f--

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