CVE-2009-2622
MediumSquid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 allows remote attackers to cause a denial of service via malformed requests including (1) "missing or mismatched protocol identifier," (2) missing or negative status value," (3) "missing version," or (4) "missing or invalid…
Published Jul 27, 2009 · Updated Mar 9, 2026
Key Facts
Patch immediately- CVE-2009-2622 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Squid (Squid-Cache), squid3 (debian).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 57% probability of exploitation in the next 30 days.
- Fixed versions are available, including squid3 3.0.STABLE-3+lenny2, squid3 3.0.STABLE8-3+lenny1, Squid 0.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
57%
Higher than 99.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2009-2622 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 allows remote attackers to cause a denial of service via malformed requests including (1) "missing or mismatched protocol identifier," (2) missing or negative status value," (3) "missing version," or (4) "missing or invalid status number," related to (a) HttpMsg.cc and (b) HttpReply.cc.
Affected Products
35 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SquidSquid-Cache | 3.0, 3.0-rc1, 3.0-rc4, 3.1, 3.1.0.1, 3.1.0.2, 3.1.0.3, 3.1.0.4 | 0 |
| squid3debian | See advisory | 3.0.STABLE8-3+lenny1 |
Patched Releases
squid3
3.0.STABLE-3+lenny2, 3.0.STABLE8-3+lenny1
Timeline
Publicly disclosed
Jul 27, 2009
Last updated
Mar 9, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- advisoryhttp://www.squid-cache.org/Advisories/SQUID-2009_2.txt
- patchhttp://www.squid-cache.org/Versions/v3/3.1/changesets/b9661.patch
- other36007
- otherMDVSA-2009:161
- otherMDVSA-2009:178
FAQ
Common Questions.
Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 allows remote attackers to cause a denial of service via malformed requests including (1) "missing or mismatched protocol identifier," (2) missing or negative status value," (3) "missing version," or (4) "missing or invalid status number," related to (a) HttpMsg.…
Affected: Squid (Squid-Cache) versions 3.0, 3.0-rc1, 3.0-rc4, 3.1, 3.1.0.1, 3.1.0.2, 3.1.0.3, 3.1.0.4; squid3 (debian). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including squid3 3.0.STABLE-3+lenny2, squid3 3.0.STABLE8-3+lenny1, Squid 0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
Is CVE-2009-2622 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo