What it is
CVE-2009-1391 is an unauthenticated vulnerability affecting Perl Compress::Raw::Zlib. Off-by-one error in the inflate function in Zlib.xs in Compress::Raw::Zlib Perl module before 2.017, as used in AMaViS,...
Vulnerability report
Exploitation attempts observed in the wild
High confidence
Not in CISA KEV
CVE-2009-1391
Compress::Raw::Zlib Denial of Service
Perl / Compress::Raw::Zlib
- Severity
- CVSS 6.8 · Medium
- Confidence
- High
- Exploit status
- Exploitation attempts observed in the wild
- EPSS
- 7.4%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Have exploitation attempts been observed?
Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.
Who is affected?
Perl / Compress::Raw::Zlib.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Compress::Raw::Zlib Denial of Service
Off-by-one error in the inflate function in Zlib.xs in Compress::Raw::Zlib Perl module before 2.017, as used in AMaViS, SpamAssassin, and possibly other products, allows context-dependent attackers to cause a denial of service (hang or crash) via a crafted zlib compressed stream that triggers a heap-based buffer overflow, as exploited in the wild by Trojan.Downloader-71014 in June 2009.
- Published
- 16 Jun 2009
- Exploitation Attempts Reported
- 16 Jun 2009
- Attack vector
- Remote
- Complexity
- —
- Privileges
- None
- User interaction
- —
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2009-1391
- USN-794-1 usn.ubuntu.com · Vendor Advisory https://usn.ubuntu.com/794-1/
- MDVSA-2009:157 mandriva.com · Vendor Advisory http://www.mandriva.com/security/advisories?name=MDVSA-2009:157
- GLSA-200908-07 security.gentoo.org · Vendor Advisory http://security.gentoo.org/glsa/glsa-200908-07.xml
- SUSE-SR:2009:012 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002...
- FEDORA-2009-7680 redhat.com · Vendor Advisory https://www.redhat.com/archives/fedora-package-announce/2009-July/msg...
- 35685 secunia.com · Third-Party Advisory http://secunia.com/advisories/35685
- 35689 secunia.com · Third-Party Advisory http://secunia.com/advisories/35689
- 35422 secunia.com · Third-Party Advisory http://secunia.com/advisories/35422
- 35876 secunia.com · Third-Party Advisory http://secunia.com/advisories/35876
- perl-compressrawzlib-inflate-bo(51062) exchange.xforce.ibmcloud.com · VDB Entry https://exchange.xforce.ibmcloud.com/vulnerabilities/51062
- 35307 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/35307
- ADV-2009-1571 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2009/1571
- 55041 osvdb.org · VDB Entry http://osvdb.org/55041
- article.gmane.org/gmane.mail.virus.amavis.user/33635 article.gmane.org · CVE Record http://article.gmane.org/gmane.mail.virus.amavis.user/33635
- thread.gmane.org/gmane.mail.virus.amavis.user/33635 thread.gmane.org · CVE Record http://thread.gmane.org/gmane.mail.virus.amavis.user/33635
- bugs.gentoo.org/show_bug.cgi bugs.gentoo.org · CVE Record https://bugs.gentoo.org/show_bug.cgi?id=273141
- bugzilla.redhat.com/show_bug.cgi bugzilla.redhat.com · CVE Record https://bugzilla.redhat.com/show_bug.cgi?id=504386
- article.gmane.org/gmane.mail.virus.amavis.user/33638 article.gmane.org · CVE Record http://article.gmane.org/gmane.mail.virus.amavis.user/33638
Exploitation evidence
Evidence of exploitation attempts
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploitation attempts observed in the wild
CVE
A trusted third party reported exploitation attempts.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2009-06-16 23:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- User-Agents
- Callback hosts
- 0
- 0
- 0
Request targets and User-Agents available in Pro. Callback host details available in Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v2.0
6.8
Medium
Potential damage if exploited. Separate from whether attackers are using it.
AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS
7.4%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
Weaknesses
Timeline
From disclosure to observed exploitation attempts
-
23:00 UTC
Added to Previdian KEV Feed
High-confidence, third-party report of exploitation attempts
-
23:00 UTC
CVE published
Vulnerability disclosed publicly
-
00:00 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2009-1391
Sample API response{
"cve_id": "CVE-2009-1391",
"confidence": "High",
"cvss_score": 6.8,
"cvss_estimated": false,
"epss_score": 0.07441,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}