CVE-2011-1764

Exim vulnerability

CVSS

7.5

EPSS

3.9%

EPSS pct

89th

Exploited

No known

Format string vulnerability in the dkim_exim_verify_finish function in src/dkim.c in Exim before 4.76 might allow remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via format string specifiers in data used in DKIM logging, as demonstrated by an identity field containing a % (percent) character.

Affected vendor

Exim

Affected product

Exim

CVSS vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Weakness type (CWE)

CWE-134 — Uncontrolled Format String

Published

2011-10-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 3.9% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2011-1764

Confirm whether Exim Exim is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2011-1764.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-1764

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2011-1764 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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