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CVE-2023-42118 is an integer-underflow vulnerability in Exim's libspf2 SPF macro parsing. Insufficient validation of attacker-controlled SPF macro data can cause an integer underflow before a subsequent memory write, enabling memory corruption and potentially arbitrary code execution. The issue is also tracked as ZDI-23-1472.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
High-severity Exim remote-code-execution vulnerability requiring use of the SPF condition in an access-control list (ACL).
One of six reported Exim vulnerabilities affecting Exim versions before 4.96.1 and 4.97; at the time of the content it was still under investigation and only mitigating protective measures were available.
One of six reported Exim vulnerabilities affecting Exim versions before 4.96.1 and 4.97; at the time of the content it was still under investigation and only mitigating measures were available.
Vulnérabilité dans la bibliothèque libspf2 incluse dans Exim permettant à un attaquant adjacent au réseau de tenter une exécution de code arbitraire.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.