Squid Vulnerabilities


The analysis of the timeline helps to identify the required approach and handling of single vulnerabilities and vulnerability collections. This overview makes it possible to see less important slices and more severe hotspots at a glance. Initiating immediate vulnerability response and prioritizing of issues is possible.


Firewall Software136

The moderation team is working with the threat intelligence team to categorize software that is affected by security vulnerabilities. This helps to illustrate the assignment of these categories to determine the most affected software types.


Squid Proxy96
Squid Web Proxy38
Squid proxy1
Squid HTTP Proxy1

Grouping vulnerabilities by products helps to get an overview. This makes it possible to determine an homogeneous landscape or the most important hotspots in heterogeneous landscapes.


Official Fix110
Temporary Fix0
Not Defined23

Vendors and researchers are eager to find countermeasures to mitigate security vulnerabilities. These can be distinguished between multiple forms and levels of remediation which influence risks differently.


Not Defined89

Researcher and attacker which are looking for security vulnerabilities try to exploit them for academic purposes or personal gain. The level and quality of exploitability can be distinguished to determine simplicity and strength of attacks.

Access Vector

Not Defined0

The approach a vulnerability it becomes important to use the expected access vector. This is typically via the network, local, or physically even.


Not Defined0

To exploit a vulnerability a certail level of authentication might be required. Vulnerabilities without such a requirement are much more popular.

User Interaction

Not Defined0

Some attack scenarios require some user interaction by a victim. This is typical for phishing, social engineering and cross site scripting attacks.

C3BM Index

Our unique C3BM Index (CVSSv3 Base Meta Index) cumulates the CVSSv3 Meta Base Scores of all entries over time. Comparing this index to the amount of disclosed vulnerabilities helps to pinpoint the most important events.

CVSSv3 Base


The Common Vulnerability Scoring System (CVSS) is an industry standard to define the characteristics and impacts of security vulnerabilities. The base score represents the intrinsic aspects that are constant over time and across user environments. Our unique meta score merges all available scores from different sources to aggregate to the most reliable result.

CVSSv3 Temp


The Common Vulnerability Scoring System (CVSS) uses temp scores to reflect the characteristics of a vulnerability that may change over time but not across user environments. This includes reporting confidence, exploitability and remediation levels. We do also provide our unique meta score for temp scores, even though other sources rarely publish them.



The moderation team is always defining the base vector and base score for an entry. These and all other available scores are used to generate the meta score.



The National Vulnerability Database (NVD) is also defining CVSS vectors and scores. These are usually not complete and might differ from VulDB scores.



A CVE Numbering Authority (CNA) is responsible for assigning new CVE entries. They might also include a CVSS score. These are usually not complete and might differ from VulDB scores.



Some vendors are willing to publish their own CVSS vectors and scores for vulnerabilities in their products. The coverage varies from vendor to vendor.



There are sometimes also security researcher which provide their own CVSS vectors and scores for vulnerabilities they have found and published.

Exploit 0-day


The moderation team is working with the threat intelligence team to determine prices for exploits. Our unique algorithm is used to identify the 0-day prices for an exploit, before it got distributed or became public. Calculated prices are aligned to prices disclosed by vulnerability broker and compared to prices we see on exploit markets.

Exploit Today


The 0-day prices do not consider time-relevant factors. The today price does reflect price impacts like disclosure of vulnerability details, alternative exploits, availability of countermeasures. These dynamic aspects might decrease the exploit prices over time. Under certain circumstances this happens very fast.

Exploit Market Volume

Our unique calculation of exploit prices makes it possible to forecast the expected exploit market volume. The calculated prices for all possible 0-day expoits are cumulated for this task. Comparing the volume to the amount of disclosed vulnerabilities helps to pinpoint the most important events.

🔴 CTI Activities

Our unique Cyber Threat Intelligence aims to determine the ongoing research of actors to anticipiate their acitivities. Observing exploit markets on the Darknet, discussions of vulnerabilities on mailinglists, and exchanges on social media makes it possible to identify planned attacks. Monitored actors and activities are classified whether they are offensive or defensive. They are also weighted as some actors are well-known for certain products and technologies. And some of their disclosures might contain more or less details about technical aspects and personal context. The world map highlights active actors in real-time.

Affected Products (4): HTTP Proxy (1), Proxy (96), Web Proxy (38), proxy (1)

Link to Vendor Website: http://www.squid-cache.org/

10/18/20215.65.4Squid Web Proxy certificate validationFirewall SoftwareNot DefinedOfficial Fix0.06CVE-2021-41611
06/09/20214.34.1Squid Web Proxy HTTP Range Request denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.00CVE-2021-31807
05/29/20213.73.6Squid Web Proxy HTTP Response denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.06CVE-2021-33620
05/28/20215.35.1Squid Web Proxy urn Scheme memory allocationFirewall SoftwareNot DefinedOfficial Fix0.06CVE-2021-28651
05/28/20213.73.6Squid Web Proxy Response Header denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.06CVE-2021-28662
05/28/20213.73.6Squid Web Proxy Cache Manager API memory leakFirewall SoftwareNot DefinedOfficial Fix0.04CVE-2021-28652
05/28/20215.35.1Squid Web Proxy Range Request denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.06CVE-2021-31808
05/28/20215.35.1Squid Web Proxy Range Request denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.05CVE-2021-31806
03/19/20217.06.7Squid Web Proxy Config Setting uri_whitespace request smugglingFirewall SoftwareNot DefinedOfficial Fix0.05CVE-2020-25097
03/10/20214.54.5Squid Web Proxy WCCP Protocol out-of-bounds readFirewall SoftwareNot DefinedNot Defined0.05CVE-2021-28116
09/02/20206.46.1Squid Web Proxy Cache request smugglingFirewall SoftwareNot DefinedOfficial Fix0.04CVE-2020-15811
09/02/20206.46.1Squid Web Proxy Header Parsing request smugglingFirewall SoftwareNot DefinedOfficial Fix0.04CVE-2020-15810
08/24/20208.68.2Squid Web Proxy Locking peer_digest.cc peerDigestHandleReply denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.04CVE-2020-24606
06/30/20208.67.6Squid Web Proxy ContentLengthInterpreter.cc request smugglingFirewall SoftwareNot DefinedOfficial Fix0.04CVE-2020-15049
06/30/20205.45.1Squid Web Proxy Synchronization pop denial of serviceFirewall SoftwareNot DefinedOfficial Fix0.05CVE-2020-14059
06/30/20206.46.1Squid Web Proxy Certificate Validation Helper null pointer dereferenceFirewall SoftwareNot DefinedOfficial Fix0.00CVE-2020-14058
04/23/20207.77.4Squid Web Proxy Digest Authentication Nonce handler integer overflowFirewall SoftwareNot DefinedOfficial Fix0.05CVE-2020-11945
04/15/20208.58.5Squid Web Proxy missing authenticationFirewall SoftwareNot DefinedNot Defined0.04CVE-2019-12524
04/15/20208.98.9Squid Web Proxy privileges managementFirewall SoftwareNot DefinedNot Defined0.05CVE-2019-12522
04/15/20207.47.4Squid Web Proxy ESI Parser out-of-bounds writeFirewall SoftwareNot DefinedNot Defined0.04CVE-2019-12521
04/15/20205.65.6Squid Web Proxy Cache input validationFirewall SoftwareNot DefinedNot Defined0.02CVE-2019-12520
04/15/20208.58.5Squid Web Proxy ESI Evaluate out-of-bounds writeFirewall SoftwareNot DefinedNot Defined0.00CVE-2019-12519
03/20/20206.15.4Squid Web Proxy cachemgr.cgi injectionFirewall SoftwareNot DefinedOfficial Fix0.00CVE-2019-18860
02/04/20206.46.1Squid Web Proxy NTLM Authentication ext_lm_group_acl input validationFirewall SoftwareNot DefinedOfficial Fix0.00CVE-2020-8517
02/04/20207.37.0Squid Web Proxy Reverse Proxy memory corruptionFirewall SoftwareNot DefinedOfficial Fix0.07CVE-2020-8450

111 more entries are not shown

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