Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the sender_verify option is true, allows remote attackers to cau
Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the sender_verify option is true, allows remote attackers to cause a denial of service and possibly execute arbitrary code during sender verification.
- Published
- Jul 7, 2004
- Updated
- Jun 16, 2026
- EPSS
- 20.5% · 97th percentile
- CWE
- —
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Report tools
Action score
36
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 6 / 30 · 20.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| university of cambridge | exim | cpe:2.3:a:university_of_cambridge:exim |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- university of cambridge eximall versions
- university of cambridge exim3.35
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | exim4 | before 4.33-1 | 4.33-1 |
| Debian:3.0 | exim | before 3.35-1woody3 | 3.35-1woody3 |
| Debian:3.0 | exim-tls | before 3.35-3woody2 | 3.35-3woody2 |
Same product
university of cambridge: all recordsOther highest-scoring records for the same primary product.
- CVE-2004-0400Stack-based buffer overflow in Exim 4 before 4.33, when the headers_check_syntax option is enabled, allows remote attackers to cause a denia32Monitor
- CVE-2003-0743Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute 32Monitor
- CVE-2001-0889Exim 3.22 and earlier, in some configurations, does not properly verify the local part of an address when redirecting the address to a pipe,32Monitor
- CVE-2005-0021Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 compone29Monitor
- CVE-2002-1381Format string vulnerability in daemon.c for Exim 4.x through 4.10, and 3.x through 3.36, allows exim administrative users to execute arbitra29Monitor
- CVE-1999-0971Buffer overflow in Exim allows local users to gain root privileges via a long :include: option in a .forward file.28Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:exim | 3.35-1woody3 · Debian:3.0 | Package registry (OSV) |
| debian:exim-tls | 3.35-3woody2 · Debian:3.0 | Package registry (OSV) |
| debian:exim4 | 4.33-1 · Debian:12 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | remote | 2004-05-06 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-62 d
- Published
- TodaySep 30, 2026+8121 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- P
Weakness class (CWE)
—
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- lists.grok.org.uk/pipermail/full-disclosure/2004-May/021015.html
- secunia.com/advisories/11558
- www.debian.org/security/2004/dsa-501
- www.debian.org/security/2004/dsa-502
- exchange.xforce.ibmcloud.com/vulnerabilities/16079
Vendor advisories and official records. Exploit/PoC links are deliberately left out.